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Wernli KJ, Wang Y, Zheng Y, Potter JD, Newcomb PA.Wernli KJ, et al.J Womens Health (Larchmt). 2009 Jul;18(7):995-1001. doi: 10.1089/jwh.2008.1068.J Womens Health (Larchmt). 2009.PMID: 19575687Free PMC article.