Karls Kevin A, Lillemoe Keith D, DeWitt John M
Division of Gastroenterology and Hepatology, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA.
Gastrointest Endosc. 2011 May;73(5):1062-4. doi: 10.1016/j.gie.2010.08.057. Epub 2010 Nov 10.