1. Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada
2. Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
3. Institute of Public Health, University of Cambridge, Cambridge, UK
4. Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada; Centre for Health Evaluation and Outcome Sciences, Providence Health Care Research Institute, Vancouver, British Columbia, Canada
5. Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada; British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada
6. British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada