1. Charité Universitätsmedizin Berlin Campus Virchow-Klinikum, Clinic for Paediatrics, Department of Oncology/Haematology, Berlin, Germany.
2. Paediatric Palliative Care Centre, Children's and Adolescent's Hospital, Datteln, and Department of Children's Pain Therapy and Paediatric Palliative Care, Witten/Herdecke University, Faculty of Health, School of Medicine, Germany.
3. Charité Universitätsmedizin Berlin Campus Virchow-Klinikum, Clinic for Paediatrics, Center for Chronically Sick Children, Berlin, Germany.
4. HealthTwiSt and Franz-Volhard Clinic, Charité Universitätsmedizin, Berlin, Germany.
5. Charité Universitätsmedizin Berlin Campus Virchow-Klinikum, Institute of Experimental Pediatric Endocrinology, Berlin, Germany.