Hamner H.C., Tinker S.C., Berry R. and Mulinare J. 2013. Modeling fortification of corn masa flour with folic acid: the potential impact on exceeding the tolerable upper intake level for folic acid, NHANES 2001-2008. Food & Nutrition Research. (Jan. 2013). DOI:https://doi.org/10.3402/fnr.v57i0.19146.