Waxman Irving, Chennat Jennifer, Konda Vani
Center for Endoscopic Research and Therapeutics, Section of Gastroenterology and Department of Medicine, University of Chicago Medical Center, Chicago, Illinois 60637, USA.
Gastrointest Endosc. 2010 Apr;71(4):875-8. doi: 10.1016/j.gie.2009.09.017.