1. Department of Pathology, Stanford University Medical School, Stanford, CA 94305.
2. Palo Alto VA Medical Center, Palo Alto, CA 94303.
3. Stanford Medical School Blood Center, Palo Alto, CA 94304.
4. Cancer Biology Research Laboratory, Department of Radiology, Stanford University, Stanford CA 94305.
5. Division of AIDS/Oncology, San Francisco General Hospital and University of California at San Francisco, San Francisco, CA 94110.
6. Palo Alto VA Medical Center, Palo Alto, CA 94303