1. Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA
2. Current affiliation: Division of Nutrition, Physical Activity and Obesity Prevention, Centers for Disease Control and Prevention, Atlanta, GA
3. Division of Health and Nutrition Examination Surveys, National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, MD
4. Current affiliation: HPV Vaccine Project, PATH, Seattle, WA
5. National Varicella Zoster Virus Laboratory, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA