1. Division of Infectious Diseases and Immunology, Saint Louis University School of Medicine, St. Louis, Missouri
2. Division of Infectious Diseases, Department of Medicine, Emory University, Atlanta, Georgia
3. Group Health Research Institute, Seattle, Washington
4. Department of Medicine, Epidemiology, and Laboratory Medicine, University of Washington, Seattle, Washington
5. Departments of Internal Medicine and Pediatric and Adolescent Medicine, Vaccine Research Group, Mayo Clinic, Rochester, Minnesota
6. Division of Pediatric Infectious Diseases, Department of Pediatrics, Emory University, Atlanta, Georgia
7. The EMMES Corporation, Rockville, Maryland