1. Georgetown University Medical Center, Washington, D.C.
2. University of Texas M.D. Anderson Cancer Center, Houston, Texas.
3. Present address: Sanofi-Aventis Pharmaceuticals, Bridgewater, New Jersey.
4. University of Kentucky Medical Center, Lexington, Kentucky.
5. Maine Medical Center, Portland, Maine.
6. Princess Margaret Hospital, Toronto, Ontario, Canada.
7. Sinai Hospital, Baltimore, Maryland.
8. University of Colorado at Denver and Health Sciences Center, Aurora, Colorado.
9. Johns Hopkins University School of Medicine, Baltimore, Maryland.
10. Genzyme Corporation, Cambridge, Massachusetts.
11. National Institutes of Health, Bethesda, Maryland.
12. Massachusetts General Hospital, Boston, Massachusetts.
13. University of Cincinnati Medical Center, Cincinnati, Ohio.