Amanda C Cohn1, Barbara E Mahon2, Rochelle P Walensky3. 1. Division of Birth Defects and Infant Disorders, National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, Georgia. 2. National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia. 3. Office of the Director, Centers for Disease Control and Prevention, Atlanta, Georgia.