1. Division of Intramural Research, National Institute of Allergy and Infectious Diseases , Baltimore, Maryland , USA
2. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health , Baltimore, Maryland , USA
3. Department of Social Medicine, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina , USA
4. Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School , Boston, Massachusetts , USA
5. Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine , Miami, Florida , USA
6. Callen-Lorde Community Health Center , New York, New York , USA
7. Brigham and Women's Hospital , Boston, Massachusetts , USA