1. Clinic of Pediatric Oncology, University of Padova, Padova, Italy
2. Pediatric Oncology, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy
3. Department of Pediatrics, Hematology, Oncology and Endocrinology, Medical University of Gdansk, Gdansk, Poland
4. Pediatric Hematology and Oncology, University Children’s Hospital Erlangen, Erlangen, Germany
5. Pediatric Oncology, Royal Manchester Children’s Hospital, Manchester, United Kingdom
6. Pediatric Surgery, University of Padova, Padova, Italy
7. Department of Pediatric Surgery, Marciniak Hospital, Wroclaw, Poland
8. Pediatric Hematology and Oncology, Institute Gustave Curie, Paris, France
9. Pediatric Hematology and Oncology, University Hospital Angers, Angers, France
10. Klinik für Kinder- und Jugendmedizin, Klinikum Dortmund gGmbH, Dortmund, Germany