A descriptive study of the prevalence of factor V (F5) 1691 G>A, prothrombin (F2) 20210G>A and methylenetetrahydrofolate reductase (MTHFR) 677C>T polymorphisms among patients with thromboembolism in the Sri Lankan population. 41st Annual Academic Sessions of the Ceylon College of Physicians, October 2-4, 2008. (Abstracted in the Proceedings of the Annual Academic Sessions of the CCP, 49)