sponsored by the National Institutes of Health and held at the School of Medicine, University of Minnesota--Duluth, Duluth, Minnesota, August 1-3, 1984 ; edited by Edwin W. Haller, Ruth A. Myers
edited by Robert H. Riddell ; sponsored by the Crohn's & Colitis Foundation of America, Inc., the National Institutes of Health, the Rebecca Meyerhoff Philanthropic Fund