1. Department of Colon and Rectal Surgery, the University of Texas MD Anderson Cancer Center, Houston, TX
2. Department of Health Services Research, the University of Texas, MD Anderson Cancer Center, Houston, TX
3. Alliance Statistics and Data Management Center, Mayo Clinic, Rochester, MN
4. The American College of Surgeons, Chicago, IL
5. Philip R. Lee Institute for Health Policy Studies, University of California, San Francisco, CA
6. Department of Surgery, University of California, San Francisco, CA
7. Alliance Statistics and Data Management Center, Scottsdale, AZ
8. Alliance Protocol Operations Office, University of Chicago, Chicago, IL
9. Department of Surgery, University of Wisconsin, Madison, WI