1. M. Dean, G. A. Huttley, R. Allikmets, S. J. O'Brien, Laboratory of Genomic Diversity, National Cancer Institute (NCI), Frederick, MD 21702-1201, USA.
2. M. Carrington, C. Winkler, M. W. Smith, Intramural Research Support Program, Science Applications International Corporation Frederick, NCI, Frederick, MD 21702-1201, USA.
3. J. J. Goedert, Viral Epidemiology Branch, NCI-Executive Plaza North, 6130 Executive Boulevard, Bethesda, MD 20892, USA.
4. S. P. Buchbinder and E. Vittinghoff, San Francisco City Clinic, Department of Public Health, 24 Van Ness Avenue, San Francisco, CA 94102-8033, USA.
5. E. Gomperts, Childrens Hospital Los Angeles, 4650 Sunset Boulevard, Los Angeles, CA 90027, USA.
6. S. Donfield, New England Research Institute, Incorporated, 9 Galen Street, Watertown, MA 02172, USA.
7. D. Vlahov, Department of Epidemiology, The Johns Hopkins School of Hygiene and Public Health, 615 North Wolfe Street, Baltimore, MD 21205, USA.
8. R. Kaslow, Department of Epidemiology, University of Alabama at Birmingham, 720 South 20th Street, Birmingham, AL 35294-0008, USA.
9. A. Saah, The Johns Hopkins School of Hygiene and Public Health, 615 North Wolfe Street, Baltimore, MD 21205, USA.
10. C. Rinaldo, University of Pittsburgh School of Public Health, 4200 5th Avenue, Pittsburgh, PA 15213, USA.
11. R. Detels, University of California, Los Angeles, Schools of Public Health and Medicine, 10833 Le Conte Avenue, Los Angeles, CA 90025-1772, USA.