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Zaak D, Karl A, Knüchel R, Stepp H, Hartmann A, Reich O, Bachmann A, Siebels M, Popken G, Stief C.Zaak D, et al. Among authors: karl a.BJU Int. 2005 Aug;96(2):217-22. doi: 10.1111/j.1464-410X.2005.05604.x.BJU Int. 2005.PMID: 16001963Review.
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