Mendes, C. C., Biselli, J. M., Zampieri, B. L., Goloni-Bertollo, E. M., Eberlin, M. N., Haddad, R., Riccio, M. F., Vannucchi, H., Carvalho, V. M., & Pavarino-Bertelli, Érika C. (2010). 19-base pair deletion polymorphism of the dihydrofolate reductase (DHFR) gene: maternal risk of Down syndrome and folate metabolism. São Paulo Medical Journal, 128(4), 215–218. Retrieved from https://periodicosapm.emnuvens.com.br/spmj/article/view/1798