[1] Erasmus MC, Dept Pediat Urol, Rotterdam, Netherlands
[2] Univ Leuven, Dept Urol, Leuven, Belgium
[3] Med Univ Innsbruck, Dept Urol, Innsbruck, Austria
[4] Hacettepe Univ, Div Pediat Urol, Ankara, Turkey
[5] Univ Groningen, Univ Med Ctr Groningen, Dept Urol & Pediat Urol, Groningen, Netherlands
[6] Dept Urol, Aarhus, Denmark
[7] Istanbul Biruni Univ, Dept Urol, Div Pediat Urol, Istanbul, Turkey
[8] East England Deanery, Dept Urol, Urol, Cambridge, England
[9] Heidelberg Univ, Univ Med Ctr Mannheim, Med Fac Mannheim, Ctr Pediat Adolescent & Reconstruct Urol, Mannheim, Germany