1. Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada.
2. Biostatistics Unit, Father Sean O'Sullivan Research Centre, St Joseph's Healthcare–Hamilton, Ontario, Canada.
3. Centre for Development of Best Practices in Health, Yaoundé Central Hospital, Yaoundé, Cameroon.
4. Department of Population Medicine, University of Guelph, Guelph, Ontario, Canada.
5. Departments of Clinical Epidemiology and Biostatistics, and Medicine, McMaster University, Hamilton, Ontario, Canada.