The venous thrombotic risk of oral contraceptives, effects of oestrogen dose and progestogen type: results of the MEGA case-control study

Astrid van Hylckama Vlieg(Leiden University Medical Center), Frits R. Rosendaal(Leiden University Medical Center), Jan P. Vandenbroucke(Leiden University), Carine J.M. Doggen(Rijnstate Hospital), Frans M. Helmerhorst(Leiden University Medical Center)
BMJ
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