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Larson KA, Luo J, Yousuf A, Ashton-Miller JA, Delancey JO.Larson KA, et al. Among authors: yousuf a.Int Urogynecol J. 2012 Jan;23(1):57-63. doi: 10.1007/s00192-011-1528-7. Epub 2011 Aug 5.Int Urogynecol J. 2012.PMID: 21818620Free PMC article.