1. Population Health Research Institute , Hamilton, Ontario , Canada
2. Department of Medicine, McMaster University , Hamilton, Ontario , Canada
3. Department of Medicine, University of Cape Town , Cape Town , South Africa
4. Wellcome Centre for Infectious Diseases Research in Africa, Institute of Infectious Disease and Molecular Medicine, University of Cape Town , Cape Town , South Africa
5. Department of Health Research Methodology, Evidence, and Impact, Faculty of Health Sciences, McMaster University , Hamilton, Ontario , Canada