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"An open label, randomized study to evaluate the effects of seven monophasic oral contraceptive regimens on hemostatic variables. Outline of the protocol. Oral Contraceptive and Hemostasis Study Group". Contraception. 59 (6): 345–55. June 1999. doi:10.1016/s0010-7824(99)00044-x. PMID10518228.
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