- Study protocol
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Stepped-care to prevent depression and anxiety in visually impaired older adults – design of a randomised controlled trial
BMC Psychiatry volume 13, Article number: 209 (2013)
Subthreshold depression and anxiety are common in the growing population of visually impaired older adults and increase the risk of full-blown depressive or anxiety disorders. Adequate treatment may prevent the development of depression or anxiety in this high risk group.
A stepped-care programme was developed based on other effective interventions and focus groups with professionals and patient representatives of three low vision rehabilitation organisations in the Netherlands and Belgium. The final programme consists of four steps: 1) watchful waiting, 2) guided self-help, 3) problem solving treatment, 4) referral to general practitioner. The (cost-)effectiveness of this programme is evaluated in a randomised controlled trial. Patients (N = 230) are randomly assigned to either a treatment group (stepped-care) or a control group (usual care). The primary outcome is the incidence of depressive and anxiety disorders, measured with the Mini International Neuropsychiatric Interview (MINI).
Preventive interventions for depression and anxiety have received little attention in the field of low vision. A stepped-care programme that focuses on both depression and anxiety has never been investigated in visually impaired older adults before. If the intervention is shown to be effective, this study will result in an evidence based treatment programme to prevent depression or anxiety in patients from low vision rehabilitation organisations. The pragmatic design of the study greatly enhances the generalisability of the results. However, a possible limitation is the difficulty to investigate the contribution of each individual step.
According to the World Health Organisation, 285 million people worldwide are visually impaired, of which 65% is 50 years or older . Due to an aging population the prevalence of visual impairment in developed countries will only increase in the future. In 2008, 311,000 people in the Netherlands were visually impaired. It is estimated that in 2020 this number will increase by 18% to 367,000 people .
Depression and anxiety symptoms are common in visually impaired older adults. Recent studies suggested that approximately one-third (range 22-42%) of visually impaired older adults experience mild but clinically significant depressive or anxiety symptoms, also known as subthreshold depression or anxiety [3–6]. This is at least twice as high as the prevalence in the general population (10-15%) . It is important to treat symptoms of depression and anxiety in an early stage, because these are the most important predictors of developing a full-blown depressive or anxiety disorder according to DSM-V criteria, such as major depression, phobic disorders or generalized anxiety disorder . Studies suggested that loss of vision increases the risk of depressive disorders [9, 10].
Depressive and anxiety disorders decrease quality of life, the ability to cope with daily life activities and even life expectancy . Even subthreshold manifestations of depression and anxiety already have adverse consequences for quality of life [7, 12] and increase health care utilisation . Depression and anxiety often accompany disabling diseases and aggravate existing disability . In addition, they may influence factors that are necessary for successful rehabilitation, such as the ability to learn new tasks, processing information and being oriented towards achieving certain goals [5, 14]. Depression and anxiety (both threshold and subthreshold) often occur together, which causes even more disability and distress in daily life [15–17]. Research has shown that very few older adults experience only depressive or anxiety disorders, without at least some symptoms of the other [16, 18].
Some studies have shown that interventions aimed at preventing major depression and/or reducing subthreshold symptoms of depression in the visually impaired can be effective. Horowitz et al. (2005) found that variable low vision rehabilitation services, such as counselling and use of optical devices had a small positive effect on the decline of depressive symptoms after two years [5, 19]. In another trial, with a follow-up period of six months, Horowitz et al. (2006) showed that optical devices that optimise residual vision, as apposed to adaptive aids that involve learning new methods to compensate for lost functions, had a positive effect on the course of depressive symptoms . Brody et al. (2006) found that a self-management programme consisting of cognitive and behavioural elements including health education and enhancement of problem-solving skills, significantly reduced depressive symptoms in people with age-related macular degeneration (AMD) after six months . Rees et al. (2007) concluded that self-management programmes for visually impaired adults are a promising way to help address emotional distress . Girdler et al. (2010) also evaluated a self-management programme in visually impaired older adults and reported significantly less depressive symptoms at 12 weeks in participants who received the programme as apposed to patients who received standard visual rehabilitation services . Rovner and Casten (2008) found that problem solving treatment (PST), a short behavioural treatment in which participants learn a new method to address problems that interfere with everyday functioning, prevented the onset of depressive disorders in elderly with AMD after two months. However, after six months there was no statistically significant difference in depressive disorders between the intervention- and control group . To prevent the onset of depression on the long term Rovner and Casten (2008) suggest to either continue treatment in this high risk group after providing PST or focus on preventive treatment for patients that show early signs of depression . Currently, Rovner and colleagues are performing the Improving Function in Age-related Macular Degeneration study (IF-AMD) in which they are investigating the efficacy of PST compared to Supportive Therapy in preventing depressive disorders . Margrain and colleagues are currently performing the Depression in Visual Impairment Trial (DEPVIT) to reduce depressive symptoms in visually impaired adults. They are comparing three groups: one group that receives PST with additional self-help materials, one group that is referred to the general practitioner (GP) and one ‘waiting list control’ group .
These studies together suggest that low vision rehabilitation services, self-management programmes and PST can be effective in addressing depressive symptoms and depressive disorders among visually impaired people. However, only a few studies evaluated the effectiveness of such interventions and these studies were only focused on depression and not on anxiety. Moreover, economic evaluations of such interventions are completely missing.
This project aims to design and test the (cost-)effectiveness of a stepped-care programme to prevent the onset of depressive and anxiety disorders in visually impaired older adults (50 years and older) with subthreshold depression and/or anxiety, in three low vision rehabilitation organisations in the Netherlands and Belgium. By reducing symptoms of depression and anxiety, the intervention is expected to positively influence (vision-related) quality of life and adaptation to vision loss. It is an indicated preventive intervention, aimed at persons who show early signs of depression and/or anxiety but do not meet the diagnostic criteria. The aim is to prevent or delay the onset of major disorders and to reduce the severity and shorten the duration of existing symptoms. Stepped-care comprises different treatment components, such as self-help and PST. The general idea is that if the first, less intensive step does not lead to a reduction of symptoms, then a patient moves to a next step which consists of a more intensive and expensive treatment type. This type of intervention is expected to be efficient, because not all patients need the same type or intensity of treatment . Several randomised controlled trials (RCTs) outside the field of low vision found that a stepped-care intervention can be effective in addressing depression and/or anxiety [28–33]. Furthermore, both the Multidisciplinary guidelines for mental healthcare in the Netherlands as the National Institute for Health and Clinical Excellence (NICE) in the United Kingdom recommend using a stepped-care model to address depression in older adults [34, 35].
Development of a stepped-care programme for visually impaired older adults
Evidence from previous studies
The first step in developing a new stepped-care programme for visually impaired older adults was to search the literature for other stepped-care programmes and interventions that were found to be effective in addressing depression and anxiety.
Different RCTs outside the field of low vision found that stepped-care programmes can be effective in reducing depression and anxiety. Araya et al (2003) found that a stepped-care programme for low-income women in Santiago (Chile), consisting of a psycho-educational group intervention and drug treatment, was effective in reducing depression after 6 months . Davidson et al. (2010) found that a stepped-care programme, consisting of PST and psychotherapy or medication, significantly decreased depressive symptoms in patients with acute coronary syndrome (ASC) and even improved the ASC prognosis . Patel et al. (2010) showed that a collaborative stepped-care programme, consisting of psycho-education, psychotherapy and medication, was effective in reducing depressive and anxiety disorders in primary care . Unutzer et al. (2008) found that a collaborative stepped-care programme, consisting of PST and medication, was cost-effective in reducing late-life depression in primary care after 12 months, with total health care cost calculations over a 4-year period . Van ‘t Veer et al. (2009) showed that a stepped-care programme for older adults in general practice (75 years and older) was effective in preventing depression and anxiety disorders after 12 months , with effects sustaining even after 24 months . This programme consisted of a period of watchful waiting, bibliotherapy (the use of reading materials as guidance), PST and referral to the GP.
A recent systematic review concluded that cognitive behavioural therapy (CBT) and PST can prevent the development of depression and anxiety in patients with subclinical manifestations of these disorders . Both treatment types help patients to acknowledge their symptoms and encourage them to switch to more active self-management strategies . Studies in the field of low vision suggest that rehabilitation services, self-management programmes and PST can be effective in addressing depressive symptoms and depressive disorders among visually impaired people [19–24]. Based on these findings an initial protocol of the stepped-care programme for this study was developed.
The second step in developing the protocol was to involve health care workers and patient representatives of the rehabilitation organisations. In this qualitative phase of the study, the initial protocol was discussed in one focus group with 12 low vision health care workers (social workers and psychologists) and two focus groups with each 4 patient representatives (one in the Netherlands and one in Belgium). Different aspects of the stepped-care programme were discussed: intensity of guidance, type of health care workers within rehabilitation organisations who could offer guidance, accessibility of the intervention and ways to stimulate patients to participate. Based on these group meetings the initial protocol was adjusted. After the adjustments, the protocol was sent to the same health care workers and patient representatives. After some revisions, the final content of the protocol was determined.
Figure 1 shows the final stepped-care programme, which consists of four consecutive steps. Each step takes approximately three months. Only if symptoms of depression and/or anxiety persist, then patients move on to the next step. Severity of symptoms is measured with the Epidemiologic Studies Depression scale (CES-D) [37, 38] and the Hospital Anxiety and Depression Scale – Anxiety (HADS-A) . Only if patients have a score of 16 or higher on the CES-D and/or a score of 7 or higher on the HADS-A, then they move on to the next step.
Step 1: watchful waiting
In the first step, patients are followed to see if symptoms of depression and/or anxiety recover spontaneously. Patients are contacted by one of the researchers (first author) at the beginning of this step to discuss their problems of depression and/or anxiety and give an explanation of this first step of the programme. Patients are told that they can contact the researcher during this period if necessary, for example if symptoms of depression and/or anxiety get worse or questions arise. In several studies it was shown that symptoms of depression and anxiety may recover spontaneously in this first period [36, 40–42].
Step 2: guided self-help
When patients still have elevated scores on the CES-D or HADS-A after 3 months, they receive the self-help course “Glance at your Dip” (‘Blik op je Dip’ in Dutch). This course is based on the course of Cuijpers et al. (2003) (called ‘In de put, uit de put’ in Dutch) which was found to be highly effective in preventing depressive and anxiety disorders [43, 44]. Techniques of CBT and PST are used in this course.
Based on the focus groups, the self-help course was rewritten and adapted specifically for patients with visual impairments, e.g. by adding examples of problems people often encounter in daily life due to their visual impairment. The self-help course is offered in a written (large font), a digital, an audio and Braille version. The self-help course helps patients to address depressogenic and anxiogenic thinking, improve social skills and increase pleasant activities and relaxation. The aim is to help patients to cope better with problems related to one’s symptoms of depression and/or anxiety, such as vision loss.
Guidance in following the self-help course is provided by occupational therapists who received a one-day training (by the first and last author). Training consisted of information about depression and anxiety, an explanation of the stepped-care programme in total, the self-help course and techniques to motivate patients in addressing their problems.
In this second step of the programme, the trained occupational therapist contacts the patient by telephone and introduces the course. If the patient agrees, two face-to-face contacts (at the rehabilitation organisation or at home) take place. Subsequently, the occupational therapist conducts several telephone calls and may schedule another face-to-face contact to encourage patients to continue with the course. The aim of the contacts is 1) to explore the symptoms of depression and anxiety, 2) to reflect on these symptoms by exploring everyday problems, 3) to create awareness of the problems and the possibility to address them, 4) to encourage participants to complete/continue the self-help course. The first two goals help to establish a working relationship between the patient and the occupational therapist. The second two goals help patients recognise their problems and the possibility to address them even in an early stage of the complaints.
Older adults who feel depressed often find it difficult to find the energy and motivation to work on their problems. Therefore, techniques of Motivational Interviewing (express empathy, roll with resistance not fight it, support self-efficacy) are used to stimulate this. Research shows that these techniques can be effective in stimulating patients in seeking and accepting help and making changes in their behaviour .
The researchers (first author; social worker and last author; psychologist), who developed the self-help course, monitor the execution of the intervention by keeping in close contact with the occupational therapists by telephone and e-mail (at least one contact every two weeks) and by organising a peer group meeting to share experiences and learn from each other. Additionally, occupational therapists and patients are asked to evaluate the self-help course on a written evaluation form. They are asked what they think about the intervention, about the guidance that was given and about the results.
Step 3: problem solving treatment (PST)
When patients still have elevated scores on the CES-D or HADS-A after step 2, they receive PST by a trained social worker or psychologist at the rehabilitation organisation. PST is a short evidence-based behavioural treatment which helps patients to regain control of their life, which reduces feelings of depression and anxiety . With PST, the patient learns to identify and address problems that interfere with everyday functioning and lead to feelings of depression and anxiety by means of 7 different steps: 1) clarifying the problem, 2) establishing a realistic goal to address the problem, 3) generating multiple solution alternatives, 4) exploring the pros and cons for each possible solution, 5) choosing the preferred solution, 6) identifying the specific steps needed to carry out the solution, 7) after trying to implement the solution, in the next meeting the process will be evaluated.
Social workers and psychologists received a one-day training in two groups by a qualified PST trainer and supervisor (psychologist, PhD) with experience in stepped-care. Information about the techniques and different steps of PST was given and was practiced in role-plays. After that, all social workers and psychologists piloted their learned skills on a patient that did not participate in this study.
In this third step of the programme the social worker or psychologist contacts the patient by telephone and introduces PST. If the patient agrees, subsequently a maximum of seven face-to-face contacts (at the rehabilitation organisation or at home) take place in which the stages of PST are explained and applied to problems encountered in daily life. Patients choose their own problems to work on and are able to use a list (large font) of potential problems (related to physical-, psychological-, practical- and social functioning) to help them think of problems to address. Furthermore, a CD with the different steps of PST is given to patients as a reminder for practising at home in between the meetings.
To secure fidelity with the intervention, a qualified PST trainer and supervisor (psychologist, PhD) guides social workers and psychologists in performing PST, by means of telephone calls and e-mail. In addition, a peer group meeting is organised to share experiences and learn from each other. Two sessions per patient are audio-taped to have a good understanding of the process. The supervisor and researcher (first author) review these tapes. Additionally, social workers, psychologists and patients are asked to evaluate the process. They are asked what they think about the intervention, about the guidance that was given and about the results.
Step 4: referral to general practitioner (GP)
When symptoms persist, patients are referred to their GP to discuss further (more intensive) treatment and to discuss the use of medication. GPs are the so called ‘gate-keepers’ for all (mental) health care facilities in the Netherlands. They can refer patients to other care providers or may prescribe medication. If patients are diagnosed with a depressive or anxiety disorder during the study, as measured with the Mini International Neuropsychiatric Interview (MINI) , they are directly referred to their GP to discuss further treatment and medication.
Not all patients in the intervention group complete all phases of the stepped-care intervention, because treatment is only initiated if symptoms of depression and/or anxiety remain elevated. Patients who recover enter a period of ‘watchful waiting’. When elevated symptom levels again indicate a need for treatment, the following step of the intervention is initiated.
Design of a randomised controlled trial (RCT)
The design of the study is a two-armed multicentre international RCT, conducted at two rehabilitation organisations in the Netherlands and one in Belgium, to evaluate the (cost-) effectiveness of the new stepped-care programme to prevent depression and anxiety in visually impaired older adults. The study protocol was approved by the Medical Ethics Committee of the VU University Medical Centre in Amsterdam, the Netherlands and the University Hospital Leuven in Belgium. It is conducted according to the principles of the Declaration of Helsinki. Patients are fully informed about the study and give written informed consent. They are allowed to withdraw this consent at any time during the study.
Low vision rehabilitation organisations in the Netherlands and Belgium operate at the interface between health care and social care. They support people with vision loss by training them to make use of their residual vision and cope with everyday problems aimed at home-, leisure-, school-, work or other activities and participation issues. That is why a programme to address depression and anxiety, in addition to usual visual rehabilitation care, fits well within this setting.
The invitation of patients (approximately N = 3000) is done in four waves, with three months in between (September 2012, December 2012, March 2013 and June 2013). This is to avoid the need for all patients having to be treated at the same time. Patients from the low vision rehabilitation organisations who are 50 years or older receive an information letter and an informed consent form. After they give written consent to participate, they are screened for eligibility.
Visually impaired older adults with subthreshold depression or anxiety, but no actual depression or anxiety disorder according to the DSM IV, with sufficient knowledge of the Dutch language, without severely impaired cognitive functioning and capable to give informed consent are eligible to participate. Depressive symptoms are measured with the Centre for Epidemiologic Studies Depression scale (CES-D) [37, 38] and anxiety symptoms with the Hospital Anxiety and Depression Scale – Anxiety (HADS-A) . Visually impaired older adults who have a score of 16 or higher on the CES-D or a score of 7 or higher on the HADS-A are eligible to participate. If participants have a depressive or anxiety disorders according to the DSM IV as measured with the Mini International Neuropsychiatric Interview (MINI) they are excluded from the study . Cognitive functioning is evaluated by means of a six-item screener. This is a modified version of the Mini-mental state examination (MMSE), with a score of 3 or more errors indicating cognitive problems . Patients who have no complaints and patients with a depressive or anxiety disorder after the first screening are not randomised but are followed in this study to see how symptoms develop over time.
Patients are randomly assigned to either the intervention group (stepped-care programme) or the control group (usual care). Randomisation is performed using a computer-generated allocation scheme based on blocks of two, stratified by 17 different locations of the three low vision rehabilitation organisations in both the Netherlands and Belgium. Usual care consists of the support low vision rehabilitation organisations normally offer to visually impaired older adults and/or care that is received by other providers on the initiative of patients.
Masking of participants and therapists is not possible due to the nature of the intervention. However, the principal investigator and the research assistants are masked until after the primary outcomes of the study are analysed.
In total seven measurements take place. One at baseline and thereafter at every step of the intervention (at 3, 6, 9 and 12 months) and at follow-up (at 18 and 24 months). Outcome measures are obtained over the phone by masked research assistants. These assistants are trained (by the first author) to follow a predetermined protocol. The first interview takes approximately 45 minutes; the next interviews take approximately 30 minutes. In Figure 2 an overview of the design is presented.
The primary outcome of this study is the incidence of depressive (major depression and dysthymia) or anxiety disorders (panic disorder, agoraphobia, social phobia and generalised anxiety disorder) as measured with the Mini International Neuropsychiatric Interview (MINI) , using the electronic version MiniManager 2.0 (de Beurs, Leiden University Medical Centre). Secondary outcome measures are subthreshold depression measured with the Centre for Epidemiologic Studies Depression scale (CES-D) [37, 38] and subthreshold anxiety measured with the Hospital Anxiety and Depression Scale – Anxiety (HADS-A) . Other secondary outcome measures are vision related quality of life as measured with the Low Vision Quality Of Life questionnaire (LVQOL) [49, 50] and health related quality of life measured with the EuroQol-5 Dimensions (EQ-5D) . Adaptation to vision loss is measured with the Adaptation to age-related Vision Loss (AVL) questionnaire  and perceived need for care is measured with the Perceived Need for Care Questionnaire (PNCQ) . For the process-evaluation the Dutch Mental Healthcare Thermometer (DMH thermometer) is used to evaluate the different steps of the stepped-care programme . For the cost-evaluation the Trimbos/iMTA questionnaire for Costs associated with Psychiatric illness (TicP) is used to measure health care utilisation  and the Short Form Health and Labour Questionnaire (SF-HLQ) to measure absenteeism and presenteeism from paid and unpaid work . Standard costs for health care utilization from the Dutch costing guidelines are used . Medication use is valued using prices of the Royal Dutch Society of Pharmacy. Productivity losses will be valued using the Friction Cost Approach. In Table 1 the different outcome measures are presented per follow-up measurement.
The power calculation is based on the study of van Van ‘t Veer et al. 2009 in which a comparable stepped-care programme was tested in older adults . Results form this study showed that over a period of two years approximately 40% of older adults in the control group, which was not depressed at baseline, became depressed during this study, versus 20% of older adults in the intervention group. Therefore, it is expected that the programme will lead to a reduction of depressive and anxiety disorders of 50% (approximately 20% versus 40%). Based on a power of 85%, a significance level of 0.05 (two-sided) and a drop-out rate of 20%, 115 patients are needed in each group to demonstrate an effect size of 0.50. Approximately 3000 visually impaired patients (of 50 years and older) of one of the rehabilitation organisations, are invited to participate in the screening for this study. We expect that approximately 30% is willing to cooperate, resulting in 900 patients who can be screened for symptoms of depression and anxiety with the CES-D and HADS-A and on depressive or anxiety disorders with the MINI, by means of a telephone interview. This will result in approximately 230 eligible patients.
The analyses are based on the intention-to-treat principle. Statistical analyses are performed using SPSS 20. First, descriptive statistics of baseline characteristics are compared to check whether randomisation is successful in generating two similar groups. Survival analyses and mixed modelling is then used to compare the treatment and control group. All available data in all measurement cycles are used to estimate the longitudinal trial outcomes at 3, 6, 9, 12, 18 and 24 months after baseline.
For the economic evaluation multiple imputation is used to impute missing data. Bias-corrected and accelerated bootstrapping with 5000 replications is used to estimate 95% confidence intervals around the mean difference in total costs between the treatment and control group. Incremental cost-effectiveness ratios (ICERs) are calculated. Bootstrapping is used to estimate the uncertainty surrounding the ICERs. Cost-effectiveness acceptability curves and net monetary benefits are also estimated.
Depression and anxiety symptoms are common in visually impaired older adults and this elderly group will only grow in the future because of the ageing of the population. It is crucial to treat depressive and anxiety symptoms, because they are the most important predictors of developing a full-blown depressive or anxiety disorder. However, the evidence for preventive interventions has received little attention in the field of low vision. This study aims to investigate an indicated preventive intervention to prevent the onset of depressive and anxiety disorders in patients that show early signs of the disorders.
This study is innovative because the (cost-)effectiveness of a stepped-care programme to prevent depression and anxiety has never been tested in a visually impaired population before. Additionally, the programme is based on successful stepped-care interventions for older adults in the general population [31–33] and other effective components of preventive interventions in the field of low vision [21, 24]. Another strength of this study is that the treatment is aimed at preventing both depression and anxiety. The few studies, that investigated interventions to reduce depression in the field of low vision, did not take anxiety into account while several other studies suggest that anxiety is as important a problem for visually impaired older adults as depression is [58, 59]. Moreover, this stepped-care programme is embedded within rehabilitation organisations for the visually impaired, where health care workers with the specific expertise of working with visually impaired older adults can offer treatment to reduce symptoms of depression and anxiety in addition to usual visual rehabilitation care. It is very important to address depression and anxiety in this setting because depression and anxiety seriously complicate successful rehabilitation. By letting healthcare workers from the rehabilitation organisations provide the treatment themselves, continuation of the intervention after the end of this trial is highly improved. This pragmatic design enhances the generalisability of this study.
The recruitment of participants is likely to be difficult because it is a challenging subject for a very frail population (older adults, visually impaired and symptoms of depression and/or anxiety). To address this challenge and to allow patients to receive oral information about the study, all patients (approximately N = 3000) who receive written patient information on the study are approached by telephone by the rehabilitation organisations. Still, drop-out rates may be high because of the vulnerability of the population (sickness, death) and because of the quantity and types of questions that are asked. The way in which these questions are asked may be confronting and cause feelings of sadness or worry. Patients might also have low motivation to comply to the different steps of the programme, because of their depressive state . Therapist support will be used to stimulate their motivation . Another challenge is the possibility of contamination: health care workers might give more attention to problems of depression and anxiety because of their newly learned skills to provide support for these problems to patients outside the intervention group. Therefore, it is stressed to health care workers to not offer treatment according to the stepped-care programme to patients outside the intervention group. Finally, it may be difficult to weigh the specific contributions of the various steps in the stepped-care programme, because of the pragmatic design of the study. Not all patients of the intervention group follow the same steps of the programme.
The importance and strengths of this study outweigh the challenges. The development and research of the (cost-)effectiveness of a stepped-care programme to prevent depressive and anxiety disorders in visually impaired older adults is of the greatest importance.
Age-related macular degeneration
Problem solving treatment
Randomised controlled trial
Cognitive behavioural therapy.
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The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-244X/13/209/prepub
This study was supported by a grant of ZonMw InZicht (The Netherlands Organization for Health Research and Development – InSight Society). Grant number: 60-0063598108.
The authors declare that they have no competing interests.
RvN conceived of the study and its design. GvR, HC, JB and TM advised in the development of the design. HvdA drafted the manuscript, which was revised by the other authors. All authors read and approved the final manuscript.
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van der Aa, H.P., van Rens, G.H., Comijs, H.C. et al. Stepped-care to prevent depression and anxiety in visually impaired older adults – design of a randomised controlled trial. BMC Psychiatry 13, 209 (2013). https://doi.org/10.1186/1471-244X-13-209
- Low vision
- Older adults