When should we operate on the patient with ulcerative colitis?
D000293:Adolescent; D000328:Adult; D000368:Aged; D001004:Anus Diseases / Q000209:etiology; D003093:Colitis, Ulcerative / Q000150:complications / Q000601:surgery* / Q000628:therapy; D003110:Colonic Neoplasms / Q000209:etiology; D004630:Emergencies; D005260:Female; D006801:Humans; D008107:Liver Diseases / Q000209:etiology; D008875:Middle Aged; D011300:Preoperative Care