1. Johns Hopkins Bloomberg School of Public Health, Department of Epidemiology, Baltimore, Maryland 21205.
2. Tajik Scientific and Research Institute of Prevention Medicine, Federal Virology Laboratory, Dushanbe, Tajikistan.
3. AIDS infoshare Russia, Dorozhny Proezd, dom 9/10, Moscow 113545, Russia.
4. Henry M. Jackson Foundation, 1401 Rockville Pike, Rockville, Maryland 20852.
5. University of California San Diego School of Medicine, San Diego, California 92093.