1. Department of Pediatric Surgery & Urology, University Hospital of Vall d'Hebron, Barcelona, Spain.
2. Department of Pediatric Surgery & Urology, Universidad Autonoma de Barcelona, Barcelona, Spain.
3. Department of Pediatric Surgery & Urology, University Hospital Nuestra Senora de Candelaria, Tenerife, Spain.
4. Department of Pediatric Surgery, King Abdulaziz University Hospital, Jeddah, Saudi Arabia.
5. Department of Pediatric Surgery & Urology, National Medical University and Clinic Oberig, Kiev, Ukraine.
6. Service de Chirurgie Pédiatrique et Urologie Toulouse, Clinique Rive du Gauche, Toulouse, France.
7. Department of Pediatric Surgery, University Hospital of Saint Etienne, Saint Etienne, France.
8. Department of Pediatric Surgery, University Hospital of Arnaud de Villanova, Lleida, Spain.