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PDF Availablehttps://doi.org/10.1136/bmj.d6423
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Cite Journal: BMJ |  Publication Date: Oct 25, 2011 |
 Citations: 534 |  License type: open-access |
Objective To assess the risk of venous thromboembolism from use of combined oral contraceptives according to progestogen type and oestrogen dose.Design National historical registry based cohort study.Setting Four registries in...
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