[1] Ctr Hosp Univ Sao Joao, Dept Urol, Porto, Portugal
[2] UCL, Univ Coll London Hosp Fdn Trust, Natl Hosp Neurol & Neurosurg, London, England
[3] Maastricht Univ, Pelv Care Ctr Maastricht, Med Ctr, Maastricht, Netherlands
[4] Univ St Gallen, Cantonal Hosp St Gallen, Sch Med, Dept Gastroenterol Hepatol, St Gallen, Switzerland
[5] Royal Devon & Exeter Hosp, Exeter, England
[6] Univ Coll Hosp, Natl Hosp Neurol & Neurosurg, London, England
[7] James Cook Univ Hosp, Middlesbrough, England
[8] Med Ctr Leeuwarden, Dept Urol, Leeuwarden, Netherlands
[9] Kantonsspital Winterthur, Winterthur, Switzerland
[10] Orebro Univ, Ctr Hlth & Med Psychol, Orebro, Sweden
[11] Univ St Gallen, Cantonal Hosp St Gallen, Sch Med, Dept Urol, St Gallen, Switzerland
[12] Ctr Hosp Univ Sao Joao, Dept Urol, Alameda Prof Hernani Monteiro, P-4200319 Porto, Portugal