INTRODUCTION
Depressive disorders are highly prevalent in the general population worldwide.1 Major depression ranks fourth on the list of disorders with the highest burden of disease and is expected to be on the top of the list in high-income countries by 2030.2 There is consensus that psychological interventions have a central role in the treatment of depressive disorders.3,6 This consensus is backed up by evidence from more than 200 randomized controlled trials, which have been summarized recently in large systematic reviews and meta-analyses.