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Ark JT, Keegan KA, Barocas DA, Morgan TM, Resnick MJ, You C, Cookson MS, Penson DF, Davis R, Clark PE, Smith JA Jr, Chang SS.Ark JT, et al.BJU Int. 2014 Jun;113(6):894-9. doi: 10.1111/bju.12245. Epub 2014 Apr 3.BJU Int. 2014.PMID: 24053444Free PMC article.