1. National Institute on Drug Abuse, National Institutes of Health, Bethesda, Maryland 20892
2. Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
3. Veterans Affairs Medical Center and Dartmouth Medical School, Hanover, New Hampshire 03755
4. University of California, San Francisco School of Medicine, San Francisco, California 94143
5. Veterans Affairs Medical Center and University of Iowa, Iowa City, Iowa 52246
6. National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892
7. Office of AIDS Research, National Institutes of Health, Bethesda, Maryland 20892
8. HIV/AIDS Bureau, Health Resources and Services Administration, Rockville, Maryland 20857