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