1. Center of Adolescent Medicine, Department of Paediatrics and Adolescent Medicine, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.
2. Department of Oncology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.
3. Department of Paediatrics and Adolescent Medicine, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.
4. Department of Hematology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.