1. Veterans Administration Ann Arbor Health Care System, Ann Arbor, Michigan
2. University of Michigan Health System, Ann Arbor, Michigan
3. University of Massachusetts Memorial Medical Center, Marlborough, Massachusetts
4. University of Toronto, Toronto, Ontario, Canada
5. Mayo Clinic, Rochester, Minnesota
6. University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
7. University of California Los Angeles Health, Los Angeles, California
8. University of North Carolina at Chapel Hill, Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina
9. Naval Medical Center, San Diego, California
10. Olympus Corporation of the Americas, High Point, North Carolina