British Columbia Centre for Disease Control, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, British Columbia Centre for Disease Control, British Columbia Centre for Disease Control, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Public Health Agency of Canada, Public Health Agency of Canada, University of Toronto - Department of Medicine, McGill University - Epidemiology, Biostatistics, & Occupational Health, British Columbia Centre for Disease Control and British Columbia Centre for Disease Control