Achanta K K, Petros J G, Cave D R, Zinny M
Department of Surgery and Department of Gastroenterology, St. Elizabeth's Medical Center of Boston, Boston, Massachusetts, USA.
Gastrointest Endosc. 1999 Apr;49(4 Pt 1):544-6. doi: 10.1016/s0016-5107(99)70063-5.