1. Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, D.C.
2. Southern California Permanente Medical Group, Kaiser Permanente Research, Pasadena, California
3. Boston University School of Public Health, Boston, Massachusetts
4. Henry Ford Hospital, Detroit, Michigan
5. Kaiser Permanente Northern California, Oakland, California
6. Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts
7. Massachusetts General Hospital, Boston, Massachusetts