1. Pediatric Surgery Unit, Department of Translational Medical Sciences, Federico II University Naples, Naples, Italy.
2. Pediatric Surgery Unit, Hospital Universitari Germans Trias i Pujol., Badalona, Barcelona, Spain.
3. Pediatric Urology Unit, University of Padua, Padua, Italy.
4. Pediatric Surgery Unit, Santobono Children Hospital, Naples, Italy.