1. School of Epidemiology and Public Health; University of Ottawa; Ottawa ON Canada
2. Department of Mathematics and Statistics; Amherst College; Amherst MA USA
3. Department of Psychiatry; Massachusetts General Hospital and Harvard Medical School; Boston MA USA
4. Department of Epidemiology; Harvard TH Chan School of Public Health; Boston MA USA
5. Department of Psychiatry; Dalhousie University Faculty of Medicine; Halifax NS Canada
6. Health Behavior Branch, Division of Intramural Population Health Research; Eunice Kennedy Shriver National Institute of Child Health and Human Development; Bethesda MD USA
7. Department of Mental Health; Johns Hopkins Bloomberg School of Public Health; Baltimore MD USA