1 Department of Clinical, Neuro, and Developmental Psychology, Amsterdam Public Health research institute, Vrije Universiteit Amsterdam, Amsterdam 1081 BT Netherlands; International Institute for Psychotherapy, Babeș-Bolyai University, Cluj-Napoca, Romania. Electronic address: p.cuijpers@vu.nl.
2 Wellcome Trust, London, UK.
3 Department of Mental Health and Substance Use, World Health Organization, Geneva, Switzerland.