1. Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Diseases Control and Prevention, Atlanta, Georgia, USA
2. Maximus Federal, Contracting Agency to the Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Diseases Control and Prevention, Atlanta, Georgia, USA
3. Division of Human Development and Disability, National Center on Birth Defects and Developmental Disabilities, Centers for Diseases Control and Prevention, Atlanta, Georgia, USA