1. Department of Paediatrics and Adolescent Medicine, Rigshospitalet, Copenhagen University Hospital, 2100 Copenhagen, Denmark
2. Department of Paediatrics and Adolescent Medicine, Aarhus University Hospital, 8200 Aarhus, Denmark
3. Department of Clinical Medicine, Faculty of Health, Aarhus University, 8200 Aarhus, Denmark
4. Department of Radiology, Rigshospitalet, Copenhagen University Hospital, 2100 Copenhagen, Denmark
5. Department of Paediatric Surgery, Rigshospitalet, Copenhagen University Hospital, 2100 Copenhagen, Denmark
6. Department of Pathology, Rigshospitalet, Copenhagen University Hospital, 2100 Copenhagen, Denmark
7. Department of Surgery and Transplantation, Rigshospitalet, Copenhagen University Hospital, 2100 Copenhagen, Denmark
8. Department of Paediatric Haematology and Oncology, H. C. Andersen Children’s Hospital, Odense University Hospital, 5000 Odense, Denmark
9. Department of Paediatrics and Adolescent Medicine, Aalborg University Hospital, 9000 Aalborg, Denmark