The incidence of IBD is higher in the North.
Center for Gastrointestinal Biology and Disease, University of North Carolina, Chapel Hill, North Carolina.
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Sandler
D000293:Adolescent; D000328:Adult; D004777:Environment; D005060:Europe / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D015212:Inflammatory Bowel Diseases / Q000453:epidemiology*; D008875:Middle Aged; D012307:Risk Factors