1. a Northrop Grumman Information Technology , Atlanta , GA
2. b Division of HIV/AIDS Prevention , Centers for Disease Control and Prevention , Atlanta , GA
3. c Health Research Association , 1111 Las Palmas Ave, Los Angeles , CA
4. d University of Miami Miller School of Medicine , Miami , Florida
5. e Emory University School of Medicine , Atlanta , GA
6. f Boston University School of Medicine and Johns Hopkins Bloomberg School of Public Health
7. g The investigators participating in the Antiretroviral Treatment and Access Study (ARTAS) are listed in the acknowledgment.