J Aznar, A Vaya, A Estelles, Y Mira, R Segui, P Villa, F Ferrando, C Falco, D Corella, and F Espana. 2000. “Risk of Venous Thrombosis in Carriers of the Prothrombin G20210A Variant and Factor V Leiden and Their Interaction With Oral Contraceptives”. Haematologica 85 (12). Pavia, Italy, 1271-76. https://doi.org/10.3324/%x.