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van Weerden WM, van Steenbrugge GJ, van Kreuningen A, Moerings EP, de Jong FH, Schröder FH.van Weerden WM, et al. Among authors: schroder fh.J Urol. 1991 Mar;145(3):631-4. doi: 10.1016/s0022-5347(17)38409-4.J Urol. 1991.PMID: 1997720