Comparison of the Risk of Pulmonary Embolism and Deep Vein Thrombosis in the Presence of Factor V Leiden or Prothrombin G20210A - Ordóñez, A. J. González; Carreira, J. M. Fernández; Alvarez, C. R. Fernández; Rodríguez, J.M. Medina; Alvarez, M. V.; Coto, E. (Thrombosis and Haemostasis, 2000)