1. Department of Paediatric and Adolescent Haematology and Oncology; Rigshospitalet; Copenhagen University Hospital; Copenhagen Denmark
2. Department of Pathology; Rigshospitalet; Copenhagen University Hospital; Copenhagen Denmark
3. Department of Paediatric Haematology and Oncology; H. C. Andersen Children's Hospital; Odense University Hospital; Odense Denmark
4. Department of Paediatric Oncology; Aarhus University Hospital; Aarhus Denmark
5. Paediatric Oncology Section; Paediatric Department; Aalborg University Hospital; Aalborg Denmark
6. Department of Growth and Reproduction; Rigshospitalet; Copenhagen University Hospital; Copenhagen Denmark
7. Department of Paediatrics; Rigshospitalet; Copenhagen University Hospital; Copenhagen Denmark
8. Cancer Section; Institute of Child Health; University College London; London UK