Tarnasky P R, Morris J, Hawes R H, Hoffman B J, Cotton P B, Cunningham J T
Digestive Disease Center, Gastroenterology, Medical University of South Carolina, Charleston 29425-2223, USA.
Gastrointest Endosc. 1996 Aug;44(2):185-7. doi: 10.1016/s0016-5107(96)70138-4.