1. Division of Hematology and Oncology, University of Cincinnati, Cincinnati, Ohio
2. SWOG Statistical and Data Management Center, Fred Hutchinson Cancer Research Center, Seattle, Washington
3. Cleveland Clinic, Cleveland, Ohio
4. University of Texas Southwestern Medical Center, Dallas
5. Division of Oncology, Washington University in St Louis, St Louis, Missouri
6. Cancer Care Specialists of Illinois, Decatur
7. University of Washington School of Medicine, Fred Hutchinson Cancer Research Center, Seattle
8. Department of Surgery, University of California, San Diego, La Jolla
9. Medical Oncology, Karmanos Cancer Institute, Detroit, Michigan
10. Gastrointestinal Oncology, Rutgers Cancer Institute of New Jersey, New Brunswick