Mackenzie Scott H, Fang John C, Kuwada Scott K
Division of Gastroenterology, Department of Medicine, University of Utah, Veterans Affairs Health Care System, Salt Lake City, Utah, USA.
Gastrointest Endosc. 2007 May;65(6):935-7. doi: 10.1016/j.gie.2006.09.019. Epub 2007 Mar 23.