1. Department of Otorhinolaryngology, Turku University Hospital University of Turku Turku Finland
2. Department of Radiology, HUS Medical Imaging Center, Helsinki University Central Hospital University of Helsinki Helsinki Finland
3. Department of Biostatistics, Turku University Hospital University of Turku Turku Finland
4. Department of Clinical Microbiology, Turku University Hospital University of Turku Turku Finland
5. Department of Paediatrics and Adolescent Medicine, Turku University Hospital University of Turku Turku Finland
6. Department of Otorhinolaryngology, Head and Neck Surgery, Helsinki University Hospital University of Helsinki Helsinki Finland