Quigley E M, Deprez P H, Hellstrom P, Husebye E, Soffer E E, Stanghellini V, Summers R W, Wilmer A, Wingate D L
Section of Gastroenterology/Hepatology, University of Nebraska Medical Center, Omaha 68198-2000, USA.
Dig Dis Sci. 1997 Dec;42(12):2395-400. doi: 10.1023/a:1018803819455.