| Affiliation: | (1) Division of Gastroenterology, Department of Medicine, George Washington University Medical Center, 2150 Pennsylvania Avenue, NW, Ambulatory Care Center, Suite 3-405, Washington, DC 20037,, USA;(2) Department of Emergency Medicine, University of Maryland Medical Center, Baltimore, Maryland, USA;(3) Division of Gastroenterology, George Washington University Medical Center, Washington, DC, USA;(4) Department of Pathology, George Washington University Medical Center, Washington, DC, USA |
