1. Kid Risk, Inc , Orlando, Florida , USA
2. Division of Viral Diseases, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
3. Office of Public Health, New York State Department of Health , Albany, New York , USA
4. Department of Epidemiology and Biostatistics, State University of New York at Albany , Albany, New York , USA
5. New York City Department of Health and Mental Hygiene , New York, New York , USA
6. Immunization Services Division, Centers for Disease Control and Prevention , Atlanta, Georgia , USA