1. Fred Hutchinson Cancer Research Center, Seattle, WA;
2. Southwestern Oncology Group Statistical Center, Seattle, WA;
3. Princess Margaret Hospital, Toronto, ON;
4. University of Chicago, Chicago, IL;
5. Montefiore Medical Center North Division, Bronx, NY;
6. Dana-Farber Cancer Institute, Boston, MA;
7. University of Arkansas for Medical Sciences, Little Rock, AR;
8. Memorial Sloan-Kettering Center, New York, NY;
9. University of Toronto, Toronto, ON;
10. Cross Cancer Institute, Edmonton, AB;
11. University of Utah, Salt Lake City, UT; and
12. Oregon Health & Science University, Portland, OR