1 University Clinic for Psychosomatic Medicine and Psychotherapy, Medical Faculty, Ruhr-University Bochum, Luebbecke, Germany.
2 Centre for Mental Health, University Health Network, Toronto, ON, Canada.
3 Division of Adolescent Medicine, Department of Pediatrics, The Hospital for Sick Children and University of Toronto, Toronto and the Research Institute, The Hospital for Sick Children, Toronto, ON, Canada.