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MacDonald TM, McCarthy EA, Walker SP.MacDonald TM, et al.Aust N Z J Obstet Gynaecol. 2015 Feb;55(1):3-10. doi: 10.1111/ajo.12264. Epub 2015 Jan 3.Aust N Z J Obstet Gynaecol. 2015.PMID: 25557743Review.