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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
Menke-Pluymers MB, Schoute NW, Mulder AH, Hop WC, van Blankenstein M, Tilanus HW.Menke-Pluymers MB, et al. Among authors: hop wc.Gut. 1992 Nov;33(11):1454-8. doi: 10.1136/gut.33.11.1454.Gut. 1992.PMID: 1452066Free PMC article.
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 Lanschot JJ, Hop WC, Voormolen MH, van Deelen RA, Blomjous JG, Tilanus HW.van Lanschot JJ, et al. Among authors: hop wc.J Am Coll Surg. 1994 Dec;179(6):705-13.J Am Coll Surg. 1994.PMID: 7524974Clinical Trial.