Exposure to combined oral contraceptives and risk of venous thromboembolism: a protocol for nested case–control studies using the QResearch and the CPRD databases
(2014)
Journal Article
Vinogradova, Y., Coupland, C., & Hippisley-Cox, J. (2014). 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, 4(4), Article e004499. https://doi.org/10.1136/bmjopen-2013-004499