Dan J Stein1, Petrus J Naudé2, Michael Berk3. 1. Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South Africa; Medical Research Council Unit on Risk and Resilience in Mental Disorders, Cape Town, South Africa. Electronic address: dan.stein@uct.ac.za. 2. Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South Africa. 3. Deakin University, IMPACT Strategic Research Centre, School of Medicine, Barwon Health, Geelong, Australia; Orygen, The Centre of Excellence in Youth Mental Health, the Department of Psychiatry and the Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Melbourne, Victoria, Australia.