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Risk of non-fatal venous thromboembolism in women using oral contraceptives containing drospirenone compared with women using oral contraceptives containing levonorgestrel: case-control study using United States claims data

BMJ 2011; 342 doi: http://dx.doi.org/10.1136/bmj.d2151 (Published 21 April 2011) Cite this as: BMJ 2011;342:d2151

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