title: Is there a genetic basis for clinical subsets of ulcerative colitis?
authors.affiliation: 1Division of Gastroenterology Beth Israel Hospital 330 Brookline Ave Boston, Massachusetts 02215, U.S.A. 2Department of Medicine University of Pittsburgh School of Medicine Pittsburgh, Pennsylvania, U.S.A.
authors.forename: M A
authors.initials: MA
authors.lastname: Peppercorn
authors.forename: R H
authors.initials: RH
authors.lastname: Duerr