| Affiliation: | 1. HealthPartners Institute for Education and Research, Minneapolis, MN, United States;2. Department of Obstetrics and Gynecology, Yale University, New Haven, CT, United States;3. Center for Health Research, Kaiser Permanente Northwest, Portland, OR, United States;4. Vaccine Study Center, Kaiser Permanente of Northern California, Oakland, CA, United States;5. Kaiser Permanente of Southern California, Pasadena, CA, United States;6. Kaiser Permanente Institute for Health Research, Denver, CO, United States;7. Denver Health Community Health Services, Denver, United States;8. Immunization Safety Office, Division of Healthcare Quality and Promotion, Centers for Disease Control and Prevention, Atlanta, GA, United States |
