1. Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, and
2. The Statistical Center for HIV/AIDS Research and Prevention, Fred Hutchinson Cancer Research Center, Seattle, Washington;
3. Vaccine Research Center, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland;
4. Emory Vaccine Center, Emory University, Atlanta, Georgia;
5. Laboratory of Infectious Disease Prevention, New York Blood Center, New York;
6. Departments of Medicine and Epidemiology/Biostatistics, University of California San Francisco;
7. University of Rochester Medical Center, School of Medicine and Dentistry, New York;
8. Division of AIDS, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, and
9. Institute of Human Virology, University of Maryland School of Medicine, Baltimore, Maryland; and
10. Division of Infectious Diseases, Columbia University College of Physicians and Surgeons, New York