High prevalence of the FVR506Q mutation causing APC resistance in a region of southern Sweden with a high incidence of venous thrombosis [letter] - Zöller, B; Norlund, L; Leksell, H; Nilsson, JE; von Schenck, H; Rosen, U; Jeps-son, JO; Dahlbäck, B (Thromb Res, 1996)