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Nilsson L, Wodlin NB, Kjølhede P.Nilsson L, et al.Aust N Z J Obstet Gynaecol. 2012 Apr;52(2):113-20. doi: 10.1111/j.1479-828X.2011.01395.x. Epub 2012 Jan 8.Aust N Z J Obstet Gynaecol. 2012.PMID: 22224504