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Persson M, Winkvist A, Mogren I.Persson M, et al. Among authors: winkvist a.BMC Pregnancy Childbirth. 2009 Nov 16;9:53. doi: 10.1186/1471-2393-9-53.BMC Pregnancy Childbirth. 2009.PMID: 19917091Free PMC article.
Haugen M, Brantsæter AL, Winkvist A, Lissner L, Alexander J, Oftedal B, Magnus P, Meltzer HM.Haugen M, et al. Among authors: winkvist a.BMC Pregnancy Childbirth. 2014 Jun 11;14:201. doi: 10.1186/1471-2393-14-201.BMC Pregnancy Childbirth. 2014.PMID: 24917037Free PMC article.
Persson M, Winkvist A, Mogren I.Persson M, et al. Among authors: winkvist a.BMC Pregnancy Childbirth. 2015 Mar 13;15:57. doi: 10.1186/s12884-015-0487-2.BMC Pregnancy Childbirth. 2015.PMID: 25884665Free PMC article.