1 Department of Internal Medicine, Henry Ford Hospital, Detroit, MI, USA.
2 Department of Gastroenterology, Hepatology & Nutrition, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
3 Department of GI Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
4 Department of Diagnostic Imaging, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
5 Department of Pathology/Lab Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
6 Department of Cancer Prevention and Population Sciences, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
7 Department of Gastroenterology, Hepatology & Nutrition, The University of Texas MD Anderson Cancer Center, Houston, TX, USA. dmrichards@mdanderson.org.