1. Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention (CDC), Atlanta, GA 30333, USA
2. Center for Biomedical Informatics, Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN 38103, USA
3. Epidemic Intelligence Service, Centers for Disease Control and Prevention (CDC), Atlanta, GA 30333, USA
4. Immunization Services Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention (CDC), Atlanta, GA 30333, USA
5. Office of the Director, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention (CDC), Atlanta, GA 30333, USA
6. Division of Global HIV and TB, Centers for Disease Control and Prevention (CDC), Atlanta, GA 30333, USA