Contraceptive Efficacy and Tolerability of Ethinylestradiol 20 Μg/Drospirenone 3 Mg in a Flexible Extended Regimen: An Open-Label, Multicentre, Randomised, Controlled Study
Journal of Family Planning and Reproductive Health Care
doi 10.1136/jfprhc-2011-100213
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Date
March 27, 2012
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BMJ