1. Childrens Hospital Los Angeles, University of Southern California, Los Angeles, California
2. Gertrude H. Sergievsky Center and Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York
3. Center for International Health and Development at the Boston University School of Public Health, Boston, Massachusetts
4. Lusaka District Health Management Team, Lusaka, Zambia
5. University Teaching Hospital, University of Zambia, Lusaka, Zambia
6. Global AIDS Program, U.S. Centers for Disease Control and Prevention, Lusaka, Zambia
7. Global AIDS Program, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia