1. Departments of Clinical Cancer Prevention the University of Texas MD Anderson Cancer Center, Houston, TX, USA
2. Department of Gastroenterology, Hepatology, and Nutrition, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
3. Clinical Cancer Genetics Program, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
4. Departments of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
5. Department of Colon and Rectal Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
6. Departments of Radiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
7. Department of Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.