1. Mwanza Intervention Trials Unit, National Institute for Medical Research, Mwanza, Tanzania
2. Kilimanjaro Christian Medical Centre, Ministry of Health, Moshi, Tanzania
3. Social Welfare, Moshi and Kilimanjaro Christian Medical University College, Moshi, Tanzania
4. Kilimanjaro Christian Medical University College, Moshi, Tanzania
5. Department of Medicine, Weill Bugando School of Medicine, Mwanza, Tanzania
6. Center for Global Health, Weill Cornell Medical College, New York, NY, USA
7. National Institute for Medical Research, Mwanza, Tanzania
8. Department of Population Health, London School of Hygiene and Tropical Medicine, London, UK