1. Department of Clinical Epidemiology & Biostatistics, McMaster University, Ontario, Canada
2. Bloomberg School of Public Health, Johns Hopkins University, USA
3. Department of Medicine, University of Toronto, Toronto, Canada
4. Department of Medicine, University of Calabar Teaching Hospital, Calabar, Nigeria
5. Division of Clinical Pharmacology & South African Traditional Medicines Research Group, University of Cape Town, South Africa
6. Faculty of Pharmacy, Rhodes University, South Africa