1. University Hospitals Cleveland Medical Center, Cleveland, Ohio
2. Louis Stokes VA Medical Center, Cleveland, Ohio
3. Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
4. Washington University School of Medicine, St. Louis, Missouri
5. Mayo Clinic, Rochester, Minnesota
6. University of North Carolina, Chapel Hill, North Carolina
7. University of Washington Medical Center, Seattle, Washington
8. Columbia University Medical Center, New York, New York
9. Cleveland Clinic Foundation, Cleveland, Ohio
10. Case Comprehensive Cancer Center, Cleveland, Ohio