Ma J. et al. 1997
Ma J., Stampfer M.J., Giovannucci E., Artigas C, Hunter D.J., Fuchs C., Willett W.C., Selhub J., Hennekens C.H., and Rozen R., 1997. Methylenetetrahydrofolate reductase polymorphism, dietary interactions, and risk of colorectal cancer. Cancer Res. 57: 1098-1102.