1. From the Departments of Medicine and Pediatrics, Massachusetts General Hospital, and the Departments of Medicine and Pediatrics, Harvard Medical School — both in Boston (A.M.N.); the Division of HIV–AIDS Prevention, National Center for HIV–AIDS, Viral Hepatitis, Sexually Transmitted Disease, and Tuberculosis Prevention, Centers for Disease Control and Prevention, Atlanta (S.S.V.); and Community and Health Systems, Indiana University School of Nursing, Indianapolis (A.S.K.).