Is the MTHFR C677T variant a genetic risk factor in the etiology of autism spectrum disorder? Is it alone or by combined with rare variants of the PHGDH gene?. Ann Med Res [Internet]. 2022 Apr. 29 [cited 2025 May 13];29(4):334-40. Available from: http://www.annalsmedres.org/index.php/aomr/article/view/4087