Longman Randy S, Remotti Helen, Green Peter H
Division of Digestive and Liver Disease, Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York, USA.
Gastrointest Endosc. 2011 Aug;74(2):403-4. doi: 10.1016/j.gie.2011.03.1117. Epub 2011 May 6.