Volk Michael L, Berg Carl L
Division of Gastroenterology and Hepatology, University of Michigan Health System, Ann Arbor, Michigan.
Division of Gastroenterology and Hepatology, Duke University Medical Center, Durham, North Carolina.
Gastroenterology. 2012 Nov;143(5):1141-1143. doi: 10.1053/j.gastro.2012.09.022. Epub 2012 Sep 19.