1. Division of Gastroenterology Brigham and Women's Hospital Harvard Medical School 75 Francis St. Boston MA 02115 USA
2. Harvard Radiation Oncology Program 55 Fruit Street Boston MA 02114 USA
3. David H. Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology 500 Main St Building 76 Cambridge MA 02142 USA
4. Department of Mechanical Engineering Massachusetts Institute of Technology 77 Massachusetts Ave Cambridge MA 02139 USA
5. Department of Radiation Oncology Dana‐Farber Cancer Institute/Brigham and Women's Hospital 44 Binney St. Boston MA 02115 USA
6. Division of Gastroenterology Massachusetts General Hospital 55 Fruit St. Boston MA 02114 USA
7. Division of Medical Physics Department of Radiation Oncology Massachusetts General Hospital 450 Brookline Avenue Boston MA 02115 USA
8. Division of Comparative Medicine Massachusetts Institute of Technology Building 16‐825, 77 Massachusetts Ave Cambridge MA 02139 USA
9. Department of Pathology Duke University Durham NC 27710 USA
10. Department of Medicine Columbia University Medical Center 622 West 168th Street, PH 9‐105 New York NY 10032 USA
11. Department of Epidemiology Mailman School of Public Health and Herbert Irving Comprehensive Cancer Center Columbia University Medical Center 722 West 168th St. New York NY 10032 USA