Lacy B E, Toor A, Bensen S P, Rothstein R I, Maheshwari Y
Section of Gastroenterology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, and the Veteran's Administration Hospital, White River Junction, Vermont, USA.
Gastrointest Endosc. 1999 Apr;49(4 Pt 1):527-32. doi: 10.1016/s0016-5107(99)70058-1.