Curvers Wouter L, van den Broek Frank J C, Reitsma Johannes B, Dekker Evelien, Bergman Jacques J G H M
Department of Gastroenterology and Hepatology, Academic Medical Centre Amsterdam, Amsterdam, The Netherlands.
Gastrointest Endosc. 2009 Feb;69(2):307-17. doi: 10.1016/j.gie.2008.09.048.