Arik V. Marcell is with Johns Hopkins School of Medicine, Division of General Pediatrics and Adolescent Medicine, and Johns Hopkins Bloomberg School of Public Health, Department of Population, Family, and Reproductive Health, Baltimore, MD. Susannah E. Gibbs, Ifta Choiriyyah, Freya L. Sonenstein, Nan M. Astone, and Jacinda K. Dariotis are also with Johns Hopkins Bloomberg School of Public Health, Department of Population, Family, and Reproductive Health. Joseph H. Pleck is with University of Illinois,...