1. Fred Hutchinson Cancer Research Center, Seattle, Washington
2. University of Washington, Seattle, Washington
3. University of Texas Health Sciences Center at San Antonio, San Antonio, Texas
4. Stanford University, Stanford, California
5. University of California San Francisco, San Francisco, California
6. Veterans Affairs Puget Sound Health Care System, Seattle, Washington
7. University of British Columbia, Vancouver, British Columbia, Canada
8. University of Michigan, Ann Arbor, Michigan
9. Eastern Virginia Medical School, Norfolk, Virginia
10. Cleveland Clinic, Cleveland, Ohio
11. Beth Israel Deaconess Medical Center, Boston, Massachusetts