1. 1Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts.
2. 2Dana-Farber Cancer Institute/ECOG-ACRIN Biostatistics Center, Boston, Massachusetts.
3. 3University of Massachusetts Lowell, Lowell, Massachusetts.
4. 4Brown University, Providence, Rhode Island.
5. 5Northwestern University, Evanston, Illinois.
6. 6University of Michigan, Ann Arbor, Michigan.
7. 7Mayo Clinic, Rochester, Minnesota.
8. 8Vanderbilt University, Nashville, Tennessee.
9. 9Emory University, Atlanta, Georgia.
10. 10Medical College of Wisconsin, Milwaukee, Wisconsin.
11. 11Stanford University, Stanford, California.
12. 12Georgetown University Hospital, Washington, DC.
13. 13University of Wisconsin-Madison, Madison, Wisconsin.
14. 14Brigham and Women's Hospital/Harvard Medical School, Boston, Massachusetts.
15. 15Wake Forest University, Winston-Salem, North Carolina.
16. 16National Cancer Institute, Rockville, Maryland.
17. 17Memorial Sloan Kettering Cancer Center, New York, New York.