David E Kaplan1,2. 1. Division of Gastroenterology and Hepatology, Perelman School of Medicine, University of Pennsylvania, 3400 Civic Center Drive, PCAM 7S GI, Philadelphia, PA, 19104, USA. dakaplan@pennmedicine.upenn.edu. 2. Corporal Michael J. Crescenz VA Medical Center, Philadelphia, PA, 19104, USA. dakaplan@pennmedicine.upenn.edu.