1. Department of Otorhinolaryngology, Head and Neck Surgery, and Audiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
2. Department of Pathology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
3. Department of Haematology, Aarhus University Hospital, Aarhus, Denmark
4. Department of Haematology, Odense University Hospital, Odense, Denmark
5. Department of Paediatrics and Adolescent Medicine, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark