1. Pediatric Surgery Unit; Department of Woman's and Children's Health; University Hospital of Padua; Padua Italy
2. Department of Pediatrics; Medical University; Gdansk Poland
3. Pediatric Oncology Department; Otto von Guericke University Children's Hospital; Magdeburg Germany
4. Pediatric Hematology-Oncology Unit, Department of Woman's and Children's Health; University Hospital of Padua; Padua Italy
5. Department of Pediatric Surgery; Marciniak Hospital; Wroclaw Poland
6. Oncology and Hematology Unit, French Pediatric Rare Tumor Group (groupe Fracture); CHU de Saint Denis de La Réunion.; Saint Denis France
7. Clinic of Pediatrics; Municipal Hospital Dortmund; Dortmund Germany
8. Pediatric Department; Gustave Roussy Cancer Campus; Villejuif France
9. Pediatric Department; Centre Oscar Lambret; Lille France
10. Fondazione IRCCS Istituto Nazionale Tumori Milano; Milan Italy
11. University Children's Hospital, Erlangen; Germany
12. Clinical Trials and Biostatistics Unit; IRCCS Istituto Oncologico Veneto; Padua Italy
13. Department of Pediatric, Adolescent, Young Adult Oncology, French Pediatric Rare Tumor group (groupe Fracture); Institut Curie; Paris France