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Ackaert KS, Hop WC, Heemskerk CA, Schröder FH.Ackaert KS, et al. Among authors: hop wc.Eur Urol. 1989;16(5):349-53. doi: 10.1159/000471614.Eur Urol. 1989.PMID: 2776805
van den Ouden D, Hop WC, Kranse R, Schröder FH.van den Ouden D, et al. Among authors: hop wc.Br J Urol. 1997 Feb;79(2):203-11. doi: 10.1046/j.1464-410x.1997.33011.x.Br J Urol. 1997.PMID: 9052471
Alers JC, Krijtenburg PJ, Rosenberg C, Hop WC, Verkerk AM, Schröder FH, van der Kwast TH, Bosman FT, van Dekken H.Alers JC, et al. Among authors: hop wc.Lab Invest. 1997 Nov;77(5):437-48.Lab Invest. 1997.PMID: 9389787