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Geographic Variability and Environmental Risk Factors in Inflammatory Bowel Disease
Ng, SC; Bernstein, CN; Vatn, MH; Lakatos, Péter László; Loftus, EV Jr; Tysk, C; O'Morain, C; Moum, B; Colombel, JF; the Epidemiology and Natural History Task Force of the International Organization of Inflammatory Bowel Disease (IOIBD)