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Sagedal LR, Vistad I, Øverby NC, Bere E, Torstveit MK, Lohne-Seiler H, Hillesund ER, Pripp A, Henriksen T.Sagedal LR, et al.BMC Pregnancy Childbirth. 2017 Jun 2;17(1):167. doi: 10.1186/s12884-017-1340-6.BMC Pregnancy Childbirth. 2017.PMID: 28577545Free PMC article.Clinical Trial.