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Witt MA, Goldstein I, Saenz de Tejada I, Greenfield A, Krane RJ.Witt MA, et al.J Urol. 1990 Jan;143(1):129-32. doi: 10.1016/s0022-5347(17)39889-0.J Urol. 1990.PMID: 2294241Free article.