[1] Univ Med Ctr Hamburg Eppendorf, Dept Urol, Hamburg, Germany
[2] Ghent Univ Hosp, Div Urol, Ghent, Belgium
[3] AZ Maria Middelares, Div Urol, Ghent, Belgium
[4] Marques Valdecilla Univ Hosp, Urol Dept, Santander, Spain
[5] Aberdeen Royal Infirm, Aberdeen, Scotland
[6] Univ Lisbon, Santa Maria Univ Hosp, Dept Urol, Lisbon, Portugal
[7] Sheffield Teaching Hosp, Dept Urol, Sheffield, England
[8] Univ Coll London Hosp, Dept Urol, London, England
[9] Univ Saskatchewan, Div Urol, Saskatoon, SK, Canada
[10] Campus Biomed Univ Rome, Dept Urol, Rome, Italy
[11] Athens Med Ctr, Dept Urol, Athens, Greece
[12] Univ Hosp Hamburg Eppendorf, Dept Urol, Martinistr 52, D-20246 Hamburg, Germany