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Chortatos A, Haugen M, Iversen PO, Vikanes Å, Eberhard-Gran M, Bjelland EK, Magnus P, Veierød MB.Chortatos A, et al.BMC Pregnancy Childbirth. 2015 Jun 23;15:138. doi: 10.1186/s12884-015-0580-6.BMC Pregnancy Childbirth. 2015.PMID: 26100060Free PMC article.