1. Division of Epidemiology and Biostatistics, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
2. Mwanza Intervention Trials Unit, Mwanza, Tanzania
3. National Institute for Medical Research, Mwanza Centre, Mwanza, Tanzania
4. Department of Population Health, London School of Hygiene and Tropical Medicine, London, UK
5. Public Health Agency of Sweden, Solna, Sweden
6. University of Manitoba, Winnipeg, MB, Canada