1. Departments of Psychiatry and of Epidemiology and Biostatistics, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario, Canada
2. Lawson Health Research Institute, London, Ontario, Canada;
3. Department of Psychiatry, Center for the Study and Prevention of Suicide, University of Rochester Medical Center, Rochester, USA
4. Department of Psychology, York University, Toronto, Ontario, Canada