1. Botswana Harvard AIDS Institute Partnership, Gaborone, Botswana;
2. Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA;
3. Bennett Statistical Consulting, Inc., Ballston Lake, NY;
4. Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, MA;
5. University of California, San Diego, La Jolla, CA;
6. National Institutes of Health, Bethesda, MD;
7. Brigham and Women's Hospital, Boston, MA; and
8. Ragon Institute of MGH, MIT, and Harvard, Cambridge, MA