Conflicts of Interest
M.R. reports receiving grants from the European Union and research funding from Janssen and Lundbeck outside the submitted work. B.W.J.H.P. has received (unrelated) research grants from Janssen Research and Boehringer Ingelheim. E.W reports receiving (unrelated) recent grants from the European Commission and UK Medical Research Council and Wellcome Trust; royalties for a therapy manual in Behavioural Activation/Cognitive Behavioural Therapy from Guilford Press; and honorarium for running workshops in his rumination-focused cognitive behavioral therapy from different national cognitive behavioral therapy organizations worldwide. The remaining authors declare that they have no competing interests.