| Institution: | 1. Immunization Safety Office, Centers for Disease Control and Prevention, Atlanta, GA, USA;2. Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Harvard Medical School and Brigham and Women's Hospital, Boston, MA, USA;3. Kaiser Permanente Vaccine Study Center, Oakland, CA, USA;4. Group Health Research Institute and University of Washington, Seattle, WA, USA;5. Institute for Health Research, Kaiser Permanente, Denver, CO, USA;6. Southern California Kaiser Permanente, Pasadena, CA, USA |
