1 Craig F. Garfield is with the Department of Pediatrics and Clarissa D. Simon is with the Department of Pediatrics, Northwestern Feinberg School of Medicine, Chicago, IL. Leslie Harrison, Ghenet Besera, Martha Kapaya, Karen Pazol, Sheree Boulet, Wanda Barfield, and Lee Warner are with the Division of Reproductive Health and Violanda Grigorescu is with the Division of Health Informatics and Surveillance, Centers for Disease Control and Prevention, Atlanta, GA.