1. Fred Hutchinson Cancer Research Center, Seattle, WA;
2. Southwest Oncology Group Statistical Center, Seattle, WA;
3. City of Hope Medical Center, Duarte, CA;
4. University of New Mexico, Albuquerque, NM;
5. Vancouver General Hospital, Vancouver, BC, Canada;
6. University of Toronto, Toronto, Ontario, Canada;
7. University of Chicago, Chicago, IL;
8. University of Michigan, Ann Arbor, MI;
9. Loyola University Medical Center, Maywood, IL;
10. Medical University of South Carolina, Charleston, SC;
11. Memorial Sloan-Kettering Cancer Center, New York, NY; and
12. Karolinska University Hospital, Stockholm, Sweden