Dulai Gareth S, Jensen Dennis M
Division of Gastroenterology, CURE Digestive Diseases Research Center, Center for the Study of Digestive Healthcare Quality and Outcomes, Greater Los Angeles Veterans Administration Healthcare System, Los Angeles, CA 90073, USA.
Gastrointest Endosc Clin N Am. 2004 Jan;14(1):101-13. doi: 10.1016/j.giec.2003.10.017.