Volk Michael L
Division of Gastroenterology and Hepatology, University of Michigan Medical School, 1500 E Medical Center Drive, 3912 Taubman, Ann Arbor, MI, 48109, USA,
Dig Dis Sci. 2014 Jan;59(1):22-3. doi: 10.1007/s10620-013-2968-3. Epub 2013 Dec 10.