Hindryckx, Pieter Can we move directly from 5-ASA to a biologic agent in ulcerative colitis? [electronic resource] - Best practice & research. Clinical gastroenterology - 9-15 p. digital Publication Type: Journal Article; Review ISSN: 1532-1916 Standard No.: 10.1016/j.bpg.2018.05.004 doi Subjects--Topical Terms: Anti-Inflammatory Agents, Non-Steroidal--pharmacologyBiological Factors--pharmacologyColitis, Ulcerative--drug therapyHumansMesalamine--pharmacology