AJ Gonzalez Ordonez, CR Fernandez Alvarez, JM Rodriguez, EC Garcia and MV Alvarez (1999) “Genetic polymorphism of methylenetetrahydrofolate reductase and venous thromboembolism: a case-control study”, Haematologica. Pavia, Italy, 84(2), pp. 190-191. doi: 10.3324/%x.