TY - RPRT TI - Why do patients with ulcerative colitis relapse? AU - S A Riley AU - V Mani AU - M J Goodman AU - S Lucas PY - 1990 DO - 10.1136/gut.31.2.179 UR - https://pubmed.ncbi.nlm.nih.gov/2311975/ ID - 2311975 ER -