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Obstetrics and Gynecology|August 8, 2013
Norethindrone acetate 1.0 milligram and ethinyl estradiol 10 micrograms as an ultra low-dose oral contraceptiveDavid F Archer, Steven T Nakajima, Allan T Sawyer, et al.
The New England Journal of Medicine|February 28, 2014
DNA sequencing versus standard prenatal aneuploidy screeningDiana W Bianchi, R Lamar Parker, Jeffrey Wentworth, et al.
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