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The long-term disease course of Inflammatory bowel disease (IBD), including Crohn’s disease (CD) and ulcerative colitis (UC), in the age of biologics has not been well described. We aimed to characterise the disease course after 10 years in CD and UC patients in a well-defined population based inception cohort.

All patients (n = 513) diagnosed with CD, UC or IBD unclassified between January 1, 2003 and December 31, 2004 in a well-defined Copenhagen area were included. Clinical data regarding treatment and outcome were recorded and patient records linked with four national registries to ensure complete data capture and follow-up. Major surgery was defined as any colectomy or intestinal resection. Disease classification was made according to the Montreal Classification. Hospitalisation was defined as any hospitalisation 3 months after date of …