1. Institute for Health Research, Kaiser Permanente Colorado, Aurora
2. Department of Epidemiology, Colorado School of Public Health, Aurora
3. Department of Endocrinology, Parkview Health and Parkview Physicians Group, Fort Wayne, Indiana
4. Kaiser Permanente Department of Research and Evaluation, Kaiser Permanente of Southern California, Pasadena
5. Marshfield Clinic Research Institute, Marshfield Clinic Health System, Marshfield, Wisconsin
6. Division of Research, HealthPartners Institute, Minneapolis, Minnesota
7. Kaiser Permanente Division of Research, Kaiser Permanente of Northern California, Oakland
8. Immunization Safety Office, Vaccine Safety Datalink, Centers for Disease Control and Prevention, Atlanta, Georgia