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Ulvik, Arve et al "Colorectal Cancer and the Methylenetetrahydrofolate Reductase 677C → T and Methionine Synthase 2756A → G Polymorphisms: A Study of 2,168 Case-Control Pairs from the JANUS Cohort." Cancer Epidemiology and Prevention Biomarkers 13.12 (2004): 2175-2180. Web. 17 Jan. 2020.