1. Faculty of Health Sciences, Simon Fraser University , Burnaby, British Columbia , Canada
2. Health Economic Research Unit, Centre for Health Evaluation and Outcome Sciences , Vancouver, British Columbia , Canada
3. Johns Hopkins University School of Medicine , Baltimore, Maryland , USA
4. Johns Hopkins Bloomberg School of Public Health , Baltimore, Maryland , USA
5. School of Health and Related Research, Health Economics and Decision Modelling, Sheffield University , Sheffield, United Kingdom
6. US Centers for Disease Control and Prevention , Atlanta, Georgia , USA
7. Department of Epidemiology, Brown University School of Public Health , Providence Rhode Island , USA
8. Faculty of Medicine, Emory University , Atlanta, Georgia , USA