Levy Michael J, Wong Kee Song Louis M, Kendrick Michael L, Misra Sanjay, Gostout Christopher J
Division of Gastroenterology and Hepatology, Mayo Clinic Foundation, Rochester, Minnesota 55905, USA.
Gastrointest Endosc. 2008 Mar;67(3):572-4. doi: 10.1016/j.gie.2007.06.063. Epub 2007 Nov 12.