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Knight M, Kurinczuk JJ, Spark P, Brocklehurst P; United Kingdom Obstetric Surveillance System Steering Committee.Knight M, et al. Among authors: kurinczuk jj.Obstet Gynecol. 2008 Jan;111(1):97-105. doi: 10.1097/01.AOG.0000296658.83240.6d.Obstet Gynecol. 2008.PMID: 18165397
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