Krier Michael, Brooke Jeffrey R, Banerjee Subhas
Division of Gastroenterology and Hepatology, Department of Medicine, Stanford University Medical Center, 300 Pasteur Drive, Room H1121, Stanford, CA 94305-5202, USA.
Dig Dis Sci. 2009 May;54(5):919-21. doi: 10.1007/s10620-009-0740-5. Epub 2009 Feb 19.