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Dunn L, Kumar S, Beckmann M.Dunn L, et al.Aust N Z J Obstet Gynaecol. 2017 Aug;57(4):426-431. doi: 10.1111/ajo.12611. Epub 2017 Mar 17.Aust N Z J Obstet Gynaecol. 2017.PMID: 28304080