Institution: | (1) Division of Gastroenterology, Washington University School of Medicine, St. Louis, Missouri, USA;(2) Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, Missouri, USA;(3) Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 South Kingshighway, 63110 St. Louis, MO, USA |