1. Kaiser Permanente Southern California, Pasadena, California
2. Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, California
3. Denver Health, Denver, Colorado
4. Kaiser Permanente Vaccine Study Center, Oakland, California
5. HealthPartners, Bloomington, Minnesota
6. Kaiser Permanente Center for Health Research, Portland, Oregon
7. Institute for Health Research, Kaiser Permanente, Denver, Colorado
8. Kaiser Permanente Washington Research Institute, Seattle
9. Marshfield Clinic Research Institute, Marshfield, Wisconsin
10. Centers for Disease Control and Prevention, Atlanta, Georgia