Nasr John Y, Lloyd Joshua, Yadav Dhiraj
Departments of Gastroenterology, Hepatology, and Nutrition, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA.
Gastroenterology. 2011 Sep;141(3):e5-6. doi: 10.1053/j.gastro.2010.05.098. Epub 2011 Jul 23.