Ramsay David B, Long Samuel E, Ali M Aamir, Entwisle Christopher, Orenstein Jan M, Rossi Christopher, Borum Marie L
Division of Gastroenterology, Department of Medicine, George Washington University Medical Center, 2150 Pennsylvania Avenue, NW, Ambulatory Care Center, Suite 3-405, Washington, DC 20037, USA.
Dig Dis Sci. 2007 May;52(5):1364-6. doi: 10.1007/s10620-006-9380-1. Epub 2007 Mar 20.