DOI:
10.1055/s-00000142
Frauenheilkunde up2date
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References
van Hylckama Vlieg A, Helmerhorst FM, Vandenbroucke JP. et al.
The venous thrombotic risk of oral contraceptives, effects of oestrogen dose and progestogen type: results of the MEGA case-control study.
BMJ 2009;
339: b2921
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