<style face="normal" font="default" size="100%">Incidence of venous thromboembolism in users of combined oral contraceptives. Methods for identifying cases and estimating person time at risk must be detailed</style>

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31<style face="normal" font="default" size="100%">Incidence of venous thromboembolism in users of combined oral contraceptives. Methods for identifying cases and estimating person time at risk must be detailed</style><style face="normal" font="default" size="100%">Incidence of venous thromboembolism in users of combined oral contraceptives. Methods for identifying cases and estimating person time at risk must be detailed</style>