Mahdian Joibari, Reza, Abolfal Movafagh, and Alireza Molaei. “Association Between Maternal and Fetal MTHFR C677T and MTRR A66G Polymorphisms With the Risk of NTDs: A Systematic Review and Meta-Analysis Study”. Iranian Red Crescent Medical Journal 23, no. 11 (November 15, 2021). Accessed December 7, 2021. https://ircmj.com/index.php/IRCMJ/article/view/1350.