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Astrid van Hylckama Vlieg, Frans M. Helmerhorst, Jan P. Vandenbroucke, Carine J.M. Doggen, Frits R. Rosendaal (2009). The venous thrombotic risk of oral contraceptives, effects of oestrogen dose and progestogen type: results of the MEGA case-control study. BMJ, 339(aug13 2), pp. b2921-b2921, DOI: 10.1136/bmj.b2921.
