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APA Citation
Van Guelpen, B., Hultdin, J., Johansson, I., Hallmans, G., Stenling, R., Riboli, E., Winkvist, A., & Palmqvist, R. (2006). low folate levels may protect against colorectal cancer. Gut, 55(10), 1461–1466. http://access.bl.uk/ark:/81055/vdc_100135181826.0x000049