[1] Catharina Hosp, Dept Urol, NL-5623 EJ Eindhoven, Netherlands
[2] Med Ctr Alkmaar, Dept Urol, Alkmaar, Netherlands
[3] VU Med Ctr Amsterdam, EMGO Inst, Amsterdam, Netherlands
[4] Maastricht Univ, FHML, Dept Educ Dev & Res, Maastricht, Netherlands
[5] Catholic Univ Hosp Leuven, Dept Urol, Louvain, Belgium
[6] Radboud Univ Nijmegen, Med Ctr, Dept Urol, NL-6525 ED Nijmegen, Netherlands