Crohn's and UC: The incidence and prevalence of IBD are increasing with time and in different regions around the world, the highest annual incidence of IBD is in Europe, followed by North America with the lowest incidence in Asia and the Middle East, although the rate of increase is highest in the latter region, suggesting that environmental factors are important. This is about 1.5 - 2 million persons in the USA.
Answered 1/25/2015
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