Li Feng, Osuoha Chima, Leighton Jonathan A, Harrison M Edwyn
Division of Gastroenterology and Hepatology, Mayo Clinic Arizona, Scottsdale, Arizona 58259, USA.
Gastrointest Endosc. 2009 Jul;70(1):189-90. doi: 10.1016/j.gie.2008.09.036. Epub 2009 Jan 18.