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BMJ. 2009 Aug 13;339:b2921. doi: 10.1136/bmj.b2921.

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

van Hylckama Vlieg A, Helmerhorst FM, Vandenbroucke JP, Doggen CJ, Rosendaal FR

Source:

https://doi.org/10.1136/bmj.b2921

PubMed:

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