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APA Citation
Olén, O., Erichsen, R., Sachs, M. C., Pedersen, L., Halfvarson, J., Askling, J., Ekbom, A., Sørensen, H. T., & Ludvigsson, J. F. (2020). colorectal cancer in Crohn's disease: a Scandinavian population-based cohort study. Lancet gastroenterology and hepatology, 5, 475–484. http://access.bl.uk/ark:/81055/vdc_100104515826.0x000003