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Eden JA, Carter GD, Jones J, Alaghband-Zadeh J.Eden JA, et al.Aust N Z J Obstet Gynaecol. 1989 Feb;29(1):30-7. doi: 10.1111/j.1479-828x.1989.tb02872.x.Aust N Z J Obstet Gynaecol. 1989.PMID: 2562597Review.