Polymorphisms in the methylenetetrahydrofolate reductase and methionine synthase reductase genes and homocysteine levels in brazilian children - Aléssio, Ana Claudia M.; Annichio-Bizzachi, Joyce M.; Bydlowski, Sérgio Paulo; Eberlin, Marcos N.; Vellasco, Adriana P.; Höehr, Nelci Fenalti (American Journal of Medical Genetics, 2004)