1. Stanford University School of Medicine, Stanford, CA
2. University of California, Los Angeles, and Veterans Administration Greater Los Angeles Healthcare System, Los Angeles, CA
3. Veterans Administration New York Harbor Healthcare System and New York University Langone Medical Center, New York, NY
4. University of Michigan and Veterans Administration Ann Arbor Healthcare System, Ann Arbor, MI
5. University of California, San Francisco, Helen Diller Family Comprehensive Cancer Center, and San Francisco Veterans Affairs Medical Center, San Francisco, CA
6. Stanford University School of Medicine, Stanford and Veterans Affairs Palo Alto Health Care System, Palo Alto, CA