1. Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milano, Italy
2. Pediatrics Clinic, Dortmund Municipal Hospital, Dortmund, Germany
3. Hematology-Oncology Division, Department of Pediatrics, Padova University Hospital, Padova, Italy
4. Department of Pediatrics, Adolescent and Young Adult Oncology, Institut Curie, Paris, France
5. Oncology Unit, Hospital Luis Calvo Mackenna, Santiago, Chile
6. National Pediatric Oncology Unit/Unidad Nacional de Oncologia Pediatrica, Guatemala City, Guatemala
7. Department of Global Pediatric Medicine, St Jude Children‘s Research Hospital, Memphis, TN, USA
8. Pediatric Surgery, Department of Pediatrics, Padova University Hospital, Padova, Italy
9. Department of Pediatric Surgery, Marciniak Hospital, Wroclaw, Poland
10. Department of Pediatrics, Medical University, Gdansk, Poland
11. Department of Pediatric Oncology, Royal Manchester Children’s Hospital, Manchester, UK
12. Pediatric Hematology-Oncology Department, Centre Hospitalier Universitaire, Angers, France
13. Department of Pediatric Oncology, King Hussein Cancer Center, Amman, Jordan
14. Pediatric Hematology and Oncology, University of Tuebingen, Tuebingen, Germany