1. Department of Medicine, University of North Carolina at Chapel Hill;
2. Department of Biostatistics, Harvard T. H. Chan School of Public Health, Boston, Massachusetts;
3. Immunology Laboratory, Vaccine Research Center, and
4. Division of AIDS, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland;
5. Columbus Technologies, El Segundo, California;
6. Bristol-Myers Squibb, Wallingford, Connecticut;
7. Bristol-Myers Squibb, Princeton, New Jersey;
8. Department of Medicine, University of Pittsburgh, Pennsylvania;
9. Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts;
10. Department of Pharmacology and Toxicology, University of Alabama School of Medicine, Birmingham