Raijman I, Walden D, Kortan P, Haber G B, Fuchs E, Siemens M, Kandel G, Marcon N E
Division of Gastroenterology, Wellesley Hospital, University of Toronto, Ontario, Canada.
Gastrointest Endosc. 1994 Sep-Oct;40(5):614-21. doi: 10.1016/s0016-5107(94)70265-9.