1. The Ohio State University Comprehensive Cancer Center, Columbus, OH;
2. The Cancer and Leukemia Group B (CALGB) Statistical Center, Duke University, Medical Center, Durham, NC;
3. University of Maryland, Baltimore, MD;
4. Comprehensive Cancer Center, Wake Forest University, Winston-Salem, NC;
5. University of Iowa, Iowa City, IA;
6. North Shore University Hospital, Manhasset, NY;
7. Roswell Park Cancer Institute, Buffalo, NY;
8. Duke University Medical Center, Durham, NC;
9. Dana-Farber Cancer Institute, Boston, MA;
10. University of Alabama at Birmingham, Birmingham, AL; and
11. University of Chicago, Chicago, IL