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Chedraui, P., Andrade, M. E., Salazar-Pousada, D., Escobar, G. S., Hidalgo, L., Ramirez, C., Spaanderman, M. E. A., Kramer, B. W., & Gavilanes, A. W. D. (n.d.). polymorphisms of the methylenetetrahydrofolate reductase gene (C677T and A1298C) in the placenta of pregnancies complicated with preeclampsia. Gynecological endocrinology, 31, 569–572. http://access.bl.uk/ark:/81055/vdc_100089569903.0x000030