JM Soria, R Quintana, C Vallve, G Iruin, C Cortes, J Fontcuberta. A boy with venous thrombosis, homozygous for factor V Leiden, prothrombin G20210A and MTHFR C667t mutations, but belonging to an asymptomatic family. Haematologica 2000;85(11):1230-1232; https://doi.org/10.3324/%x.