1. ICAP at Columbia University, New York, New York, USA.
2. Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York, USA.
3. Division of Global HIV and TB, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
4. ICAP at Columbia University, Harare, Zimbabwe.
5. Ministry of Health and Child Care, Harare, Zimbabwe.
6. GALZ, Harare, Zimbabwe.
7. Division of Global HIV and TB, U.S. Centers for Disease Control and Prevention, Harare, Zimbabwe.