RT Journal Article SR Electronic T1 Comparison of the clinical features of Crohn’s disease and ulcerative colitis with onset in childhood or adolescence JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 13 OP 16 VO 49 IS 1 A1 Michener, William M. A1 Whelan, Gregory A1 Greenstreet, Richard L. A1 Farmer, Richard G. YR 1982 UL http://www.ccjm.org/content/49/1/13.abstract AB