1. Paediatric Palliative Care Centre and German Paediatric Pain Centre, Children’s and Adolescents’ Hospital, Datteln, Germany
2. Department of Children’s Pain Therapy and Paediatric Palliative Care, School of Medicine, Faculty of Health, Witten/Herdecke University, Datteln, Germany
3. Children’s and Adolescents’ Hospital Datteln and Department of Pediatrics, School of Medicine, Faculty of Health, Witten/Herdecke University, Datteln, Germany
4. University Hospital Aachen, Division of Pediatric Hematology, Oncology and Stem Cell Transplantation, Department of Pediatrics, RWTH Aachen University, Aachen, Germany
5. Department of Pediatrics, Protestant Hospital Bielefeld, Bielefeld, Germany
6. Department of Pediatric Oncology, Hematology and Immunology, University Hospital Bonn, Bonn, Germany
7. Division of Pediatric Hematology and Oncology, Department of Pediatrics, Hospital Dortmund, Dortmund, Germany
8. Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, University Hospital Düsseldorf, Düsseldorf, Germany
9. Department of Pediatrics, Hospital Lippe-Detmold, Detmold, Germany
10. Hematology/Oncology, Pediatrics III, University Hospital Essen, Essen, Germany
11. Gemeinschaftskrankenhaus Herdecke and Integrative Pediatrics, School of Medicine, Faculty of Health, Witten/Herdecke University, Herdecke, Germany
12. Department of Pediatric Hematology/Oncology, Children’s Hospital Köln, Köln, Germany
13. Department of Paediatric Oncology and Hematology, Policlinic for Children and Adolescents, University Hospital Köln, Köln, Germany
14. Centre for Pediatrics and Adolescent Medicine, HELIOS Hospital Krefeld, Krefeld, Germany
15. Department for Children and Adolescents, Johannes Wesling Hospital Minden, Bochum University, Minden, Germany
16. Department of Paediatric Hematology and Oncology, Policlinic for Children and Adolescents, University Hospital Münster, Münster, Germany
17. Department of Paediatric Hematology and Oncology, Asklepios Hospital Sankt Augustin GmbH, Sankt Augustin, Germany
18. Department of Pediatrics, Helios Medical Centre, Witten-Herdecke University, Wuppertal, Germany
19. Department of Psychosocial Oncology and Palliative Care, Dana-Farber Cancer Institute, Boston Children’s Hospital, Harvard Medical School, Boston, MA, USA