Geographic distribution of the 20210G to a prothrombin variant - Rosendaal, FR; Doggen, CJ; Zivelin, A; Arruda, VR; Aiach, M; Siscovick, DS; Hillarp, A; Watzke, HH; Bernardi, F; Cumming, AM; Preston, FE; Reitsma, PH (Thromb Haemost, 1998)