1. Center for Drug Safety and Effectiveness, Bloomberg School of Public Health Johns Hopkins University Baltimore Maryland USA
2. Department of Epidemiology Milken Institute School of Public Health, The George Washington University Washington District of Columbia USA
3. McLaughlin Centre for Population Health Risk Assessment University of Ottawa Ottawa Ontario Canada
4. School of Mathematics and Statistics Carleton University Ottawa Ontario Canada
5. Division of General Internal Medicine Johns Hopkins Medicine Baltimore Maryland USA
6. Department of Epidemiology and Biostatistics, Arnold School of Public Health University of South Carolina Columbia South Carolina USA
7. School of Epidemiology and Public Health University of Ottawa Ottawa Ontario Canada