1. Dietary B Vitamin and Methionine Intakes and Plasma Folate Are Not Associated with Colorectal Cancer Risk in Chinese Women
   Martha J. Shrubsole et al, 2009, Cancer Epidemiology, Biomarkers & Prevention CrossRef
2. Folate Nutrition and Prostate Cancer Incidence in a Large Cohort of US Men
   Victoria L. Stevens et al, 2006, American Journal of Epidemiology CrossRef