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Shek KL, Dietz HP.Shek KL, et al.Aust N Z J Obstet Gynaecol. 2008 Jun;48(3):337-42. doi: 10.1111/j.1479-828X.2008.00877.x.Aust N Z J Obstet Gynaecol. 2008.PMID: 18532968