1. Department of Obstetrics and Gynecology, University of North Carolina at Chapel Hill, Chapel Hill, NC;
2. UNC Project Malawi, Lilongwe, Malawi;
3. Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC;
4. UNC Center for AIDS Research, University of North Carolina at Chapel Hill, Chapel Hill, NC;
5. Department of Health Behavior and Health Education, University of Michigan, Ann Arbor, MI;
6. Department of Health Behavior, University of North Carolina at Chapel Hill, Chapel Hill, NC;
7. Department of Population Studies and Global Health, University of Zambia, Lusaka, Zambia;
8. Center for International Health, Education, and Biosecurity, Lilongwe, Malawi;
9. Partners in Hope, Lilongwe, Malawi; and
10. Department of Health Policy and Systems, University of Zambia, Lusaka, Zambia.