1. British Columbia Center for Disease Control, 655 W 12th Avenue, Vancouver, BC V5Z 4R4, Canada
2. Department of Psychiatry, UBC, 2255 Wesbrook Mall, Vancouver, BC V6T 2A1, Canada
3. School of Population and Public Health, University of British Columbia, 2206 E Mall, Vancouver, BC V6T 1Z8, Canada
4. British Columbia Emergency Health Services, Block C—2261 Keating Cross Road, Saanichton, BC V8M 2A5, Canada