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Professor Prateek Sharma, Professor Medicine, University of Kansas School of Medicine and Veterans Affairs Medical Center, Kansas City, Missouri, and Southern Arizona Veterans Affairs Health Care System and Arizona Health Sciences Center, Tucson, Arizona, USA Professor Richard Sampliner, Professor of Medicine at the University of Arizona, Tucson, AZ, USA , and Chief of Gastroenterology at the Southern Arizona VA Health Care System David Ilson, MD, PHD, Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, NY, USA |