1. Pediatric Surgery Division; Department of Women's and Children's Health; University of Padua; Padua Italy
2. Department of Oncology for Children and Adolescents; Institute Gustave Roussy; Villejuif Cedez France
3. IBCSG Coordinating Center; Effingerstrasse 40 3008 Berne Switzerland
4. Pediatric Oncology Unit; Fondazione IRCCS Istituto Nazionale Tumori; Milan Italy
5. Department of Pathology; Children's Hospital of Pittsburgh of UPCM; Pittsburgh Pennsylvania
6. ISMETT - Istituto Mediterraneo per i Trapianti e Terapie ad alta specializzazione; Pediatric Surgery; Palermo Italy
7. Department of Pediatric Oncology; Emma Children's Hospital; Academic Medical Centre; Amsterdam The Netherlands
8. Department of Oncology; Birmingham Children's Hospital; Birmingham United Kingdom
9. Department of Surgery and Urology for Children and Adolescents; Medical University of Gdansk; Gdansk Poland
10. University of Nottingham; Nottingham United Kingdom
11. Department of Pediatric Surgery; Kinderspital Zürich; University of Zürich; Zürich Switzerland
12. Department of Pediatric Surgery; Bicêtre Hospital; Paris Sud University; Le Kremlin Bicêtre Paris France
13. Department of Oncology; Great Ormond Street Hospital; NHS Trust; London WC1N 3JH United Kingdom
14. Department of Women's and Children's Health; University of Padua; Padua Italy