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  • Exposure to combined oral contraceptives and risk of venous thromboembolism: a protocol for nested case–control studies using the QResearch and the CPRD databases

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Epidemiology
Protocol
Exposure to combined oral contraceptives and risk of venous thromboembolism: a protocol for nested case–control studies using the QResearch and the CPRD databases

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Cite this article as:
Vinogradova Y, Coupland C, Hippisley-Cox J
Exposure to combined oral contraceptives and risk of venous thromboembolism: a protocol for nested case–control studies using the QResearch and the CPRD databases
BMJ Open 2014;4:e004499. doi: 10.1136/bmjopen-2013-004499