Affiliation: | a Maimonides Medical Center, Department of Obstetrics and Gynecology, Brooklyn, and Mount Sinai School of Medicine, New York, New York b Johns Hopkins Bloomberg School of Public Health, Department of Epidemiology, Baltimore, Maryland c Department of Pathology and Laboratory Medicine, Alpert Medical School at Brown University and Women and Infants Hospital, Providence, Rhode Island d Montefiore Medical Center, Departments of Medicine and Epidemiology, Bronx, New York e Pediatric, Adolescent and Maternal AIDS Branch, the Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Maryland f Department of Medicine, John H. Stroger, Jr. (formerly Cook County) Hospital and Rush Medical College, Chicago, Illinois g Department of Pediatrics and Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California h Department of Medicine, Georgetown University Medical Center, Washington, D.C. i Maimonides Medical Center, Department of Obstetrics and Gynecology, Brooklyn, and SUNY Downstate Medical Center, New York, New York j University of California, San Francisco School of Medicine, San Francisco, California |