1. Department of Community Health and Epidemiology; Dalhousie University; Halifax Nova Scotia Canada
2. Department of Mathematics and Statistics; University of Guelph; Guelph Ontario Canada
3. Department of Psychiatry; University of Toronto; Toronto Ontario Canada
4. Mood Disorders Centre of Ottawa; Ottawa University Health Services; Ottawa Ontario Canada
5. Department of Psychology; Concordia University; Montreal Quebec Canada
6. Department of Psychiatry; University of Calgary; Calgary Alberta Canada