[1] Ghent Univ Hosp, Urol Dept, Ghent, Belgium
[2] UMC Utrecht, Urol Dept, Utrecht, Netherlands
[3] Vanderbilt Univ, Med Ctr, Urol Dept, Nashville, TN USA
[4] Univ Bristol, Bristol Urol Inst, Bristol, Avon, England
[5] Univ Sheffield, Sheffield Teaching Hosp NHS Fdn Trust, Dept Urol, Sheffield, S Yorkshire, England
[6] Maastricht Univ, Urol Dept, Med Ctr, Maastricht, Netherlands
[7] Ain Shams Univ, Urol Dept, Cairo, Egypt
[8] Univ Philadelphia, Urol Dept, Philadelphia, PA USA