R Vormittag, T Vukovich, C Mannhalter, E Minar, V Schonauer, C Bialonczyk, M Hirschl, I Pabinger. Haptoglobin phenotype 2-2 as a potentially new risk factor for spontaneous venous thromboembolism. Haematologica 2005;90(11):1557-1561; https://doi.org/10.3324/%x.