Weinstein SJ, Gridley G, Harty LC, Brown LM, Hayes RB, Diehl SR, Winn DM, Bravo-Otero E. Folate Intake, Serum Homocysteine and Methylenetetrahydrofolate Reductase (MTHFR) C677T Genotype Are Not Associated with Oral Cancer Risk in Puerto Rico. The Journal of Nutrition. 2002 Apr;132(4):762–7. doi: 10.1093/jn/132.4.762.
Folate Intake, Serum Homocysteine and Methylenetetrahydrofolate Reductase (MTHFR) C677T Genotype Are Not Associated with Oral Cancer Risk in Puerto Rico