1. Department of Pediatric- and Adolescent Surgery; Medical University of Graz; Graz; Austria
2. General Pediatric Surgery; Robert Debre Hospital and Paris VII Denis Diderot University; Paris; France
3. Surgical Department; Heim Pál Children's Hospital; Budapest; Hungary
4. Department of Pediatric Surgery; München Schwabing, Munich; Germany
5. Pediatric Surgery Unit; Hospital Univsersitario Materno-Infantil de Canarias; Las Palmas de Gran Canaria; Spain
6. Department of Surgery; University Hospital Aachen; Aachen; Germany
7. Department of Surgery and Urology for Children and Adolescents; Medical University of Gdansk; Gdansk; Poland
8. Department of Pediatric Surgery; Ege University Faculty of Medicine; Izmir; Turkey
9. Pediatric Surgery Department; Hospital Universitari Vall d'Hebron; Barcelona; Spain
10. Department of Pediatric Surgery; “Federico II” University of Naples; School of Medicine; Naples; Italy