In addition, the UC:CD ratio showed a decreasing trend over time, which was confirmed to be the same as the results shown in previous studies. 9 , 17 Similarly, compared to a study conducted in Kuala Lumpur, Malaysia, 18 the number of patients with IBD increased gradually, and the UC:CD ratio decreased, even though both the incidence and prevalence were much higher on Jeju Island.
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Thirty-year Trend in Inflammatory Bowel Disease on Jeju Island, South Korea.
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