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BMJ. 2015 May 26;350:h2135. doi: 10.1136/bmj.h2135.

Use of combined oral contraceptives and risk of venous thromboembolism: nested case-control studies using the QResearch and CPRD databases.

Vinogradova Y, Coupland C, Hippisley-Cox J

Source:

https://doi.org/10.1136/bmj.h2135

PubMed:

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