Ahmad Asyia, Frank Barbara B
Division of Gastroenterology and Hepatology, Drexel University College of Medicine, 219 North Broad Street, 5th Floor, Philadelphia, PA 19107, USA.
Gastroenterol Clin North Am. 2011 Jun;40(2):xiii-xiv. doi: 10.1016/j.gtc.2011.04.001.