1. Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland.
2. Division of Clinical Care and Research, Institute of Human Virology, University of Maryland School of Medicine, Baltimore, Maryland.
3. Gilead Sciences Inc., Foster City, California.
4. Philadelphia Veterans Affairs Medical Center, Philadelphia, Pennsylvania.
5. University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania.
6. Harvard School of Public Health, Boston, Massachusetts.
7. University of California at San Francisco, San Francisco, California.