Rosario M T, Raso C L, Comer G M, Clain D J
Department of Medicine, Harlem Hospital Center, College of Physicians and Surgeons, Columbia University, New York, New York 10037.
Gastrointest Endosc. 1989 Mar-Apr;35(2):102-3. doi: 10.1016/s0016-5107(89)72718-8.