https://www.oiiq.org/colite-ulcereuse-et-maladie-de-crohn 2021 Canada journal article ulcer inflammation Ulceration Colitis colitis, ulcerative Ulcer symptom, nos syndrome chronic ulcerative colitis, nos Symptom crohn's disease, nos Inflammation colitis drug and narcotic control Diseases drug, nos drug control crohn disease inflammation, nos Inflammation colitis