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Callaway LK, Lust K, McIntyre HD.Callaway LK, et al.Aust N Z J Obstet Gynaecol. 2005 Feb;45(1):12-6. doi: 10.1111/j.1479-828X.2005.00333.x.Aust N Z J Obstet Gynaecol. 2005.PMID: 15730358
Rowlands I, Graves N, de Jersey S, McIntyre HD, Callaway L.Rowlands I, et al.Semin Fetal Neonatal Med. 2010 Apr;15(2):94-9. doi: 10.1016/j.siny.2009.09.003. Epub 2009 Oct 12.Semin Fetal Neonatal Med. 2010.PMID: 19819773Review.