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Amer-Wåhlin I, Yli B, Rosen KG.Amer-Wåhlin I, et al.BJOG. 2009 Jul;116(8):1138-9; author reply 1139-40. doi: 10.1111/j.1471-0528.2009.02183.x.BJOG. 2009.PMID: 19515155No abstract available.