[1] Kantonsspital St Gallen, Dept Urol, CH-9007 St Gallen, Switzerland
[2] Univ Coll London Hosp NHS Fdn Trust, Pain Management Ctr, London, England
[3] Hosp Sao Joao, Dept Urol, Oporto, Portugal
[4] Univ Coll London Hosp, Dept Uroneurol, London, England
[5] James Cook Univ Hosp, Pain Management Unit, Middlesbrough, Cleveland, England
[6] Univ Groningen, Univ Med Ctr Groningen, Dept Urol, Groningen, Netherlands
[7] Univ Hosp Bochum, Marienhosp Herne, Herne, Germany
[8] UCL, Res Dept Clin Educ & Hlth Psychol, London, England