The methylenetetrahydrofolate reductase C677T gene polymorphysm decreases the risk of childhood acute lymphocytic leukaemia - Franco, Rendrick F.; Simões, Belinda Pinto; Tone, Luiz Gonzaga; Gabellini, Sérgio M.; Zago, Marco Antônio; Falcão, Roberto Passetto (British Journal of Haematology, 2001)