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Callegari LS, Zhao X, Nelson KM, Borrero S.Callegari LS, et al. Among authors: borrero s.Contraception. 2015 May;91(5):386-92. doi: 10.1016/j.contraception.2015.01.013. Epub 2015 Jan 28.Contraception. 2015.PMID: 25636807
Borrero S, Mor MK, Zhao X, McNeil M, Ibrahim S, Hayes P.Borrero S, et al.Contraception. 2012 Jun;85(6):580-8. doi: 10.1016/j.contraception.2011.10.010. Epub 2011 Dec 15.Contraception. 2012.PMID: 22176794
Borrero S, Zite N, Potter JE, Trussell J, Smith K.Borrero S, et al.Contraception. 2013 Dec;88(6):691-6. doi: 10.1016/j.contraception.2013.08.004. Epub 2013 Aug 14.Contraception. 2013.PMID: 24028751Free PMC article.
Callegari LS, Zhao X, Nelson KM, Lehavot K, Bradley KA, Borrero S.Callegari LS, et al. Among authors: borrero s.Contraception. 2014 Jul;90(1):97-103. doi: 10.1016/j.contraception.2014.02.028. Epub 2014 Mar 6.Contraception. 2014.PMID: 24731860