1. Department of Gastrointestinal Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
2. Steele Laboratories, Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA
3. Department of Diagnostic Imaging, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
4. Hurley Medical Center, Michigan State University, East Lansing, MI 48824, USA
5. Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
6. Department of Biostatistics, Epidemiology, and Biostatistics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
7. Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
8. Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
9. Department of Interventional Radiology, Division of Diagnostic Imaging, MD Anderson Cancer Center, Houston, TX 77030, USA
10. Department of Hematopathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA