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Hall KS, Steinberg JR, Cwiak CA, Allen RH, Marcus SM.Hall KS, et al. Among authors: steinberg jr.Am J Obstet Gynecol. 2015 Jun;212(6):740-6. doi: 10.1016/j.ajog.2014.12.010. Epub 2014 Dec 12.Am J Obstet Gynecol. 2015.PMID: 25511241Free PMC article.Review.
Vafai Y, Steinberg JR.Vafai Y, et al. Among authors: steinberg jr.Contraception. 2018 Apr;97(4):335-340. doi: 10.1016/j.contraception.2017.12.013. Epub 2017 Dec 26.Contraception. 2018.PMID: 29287671Free PMC article.