1. Clinical Research Directorate, Frederick National Laboratory for Cancer Research, Bethesda, Maryland (S.K.)
2. National Institutes of Health, Bethesda, Maryland (K.S., A.K.P., H.C.L., H.M.)
3. Harbor-University of California, Los Angeles Medical Center, Torrance, California (E.D.)
4. Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts (R.G.)
5. University of Pennsylvania, Philadelphia, Pennsylvania (P.T.)
6. University of Washington, Seattle, Washington (L.E.)
7. Weill Cornell Medicine, New York, New York (R.M.G.).