1. Department of Otorhinolaryngology & Head and Neck Surgery, Østfold Sykehus, Gralum, Norway
2. Department of Otorhinolaryngology & Head and Neck Surgery, Oslo University Hospital, Rikshospitalet, Norway
3. Department of Medical Genetics, Oslo University Hospital, Rikshospitalet, Norway
4. Department of Pathology, Oslo University Hospital, Rikshospitalet, Norway
5. Department of Nuclear Medicine, Oslo University Hospital, Oslo, Norway
6. Faculty of Medicine, University of Oslo, Oslo, Norway