Affiliation: | (1) Department of Gastroenterology, University of Nebraska Medical Center, Omaha, Nebraska, USA;(2) Gastro-Intestinal Associates, P.C., Omaha, Nebraska, USA;(3) Departments of Pathology/Microbiology, University of Nebraska Medical Center, Omaha, Nebraska, USA;(4) Section of Gastroenterology, University of Nebraska Medical Center, 983285 Nebraska Medical Center Drive, Omaha, Nebraska 68198-3285, USA |