Fig. 1

Flow of participants through the trial. ⁺ Numbers in brackets refer to patients lost to follow-up and drop outs concerning the secondary outcome. Numbers of patients lost to follow-up differ between primary and secondary outcomes because the primary outcome was assessed via a telephone interview, and the secondary outcome as a postal questionnaire. Kerper et al., Effects of an innovative psychotherapy program for surgical patients - Bridging Intervention in Anesthesiology: A randomized controlled trial. Anesthesiology 2015;123:148-59 [6]