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Edozien LC, Gurol-Urganci I, Cromwell DA, Adams EJ, Richmond DH, Mahmood TA, van der Meulen JH.Edozien LC, et al.BJOG. 2014 Dec;121(13):1695-703. doi: 10.1111/1471-0528.12886. Epub 2014 Jul 9.BJOG. 2014.PMID: 25040835