1. Washington School of Medicine and the Fred Hutchinson Cancer Research Center, Seattle, Washington 98109
2. Duke University School of Medicine, Durham, North Carolina 27710
3. The EMMES Corporation, Potomac, Maryland 20854.
4. Johns Hopkins University School of Public Health, Baltimore, Maryland 21205
5. University of Rochester, Rochester, New York 14642
6. St. Louis University School of Medicine and St. Louis VA Medical Center, St. Louis, Missouri 63110