1. Department of Otorhinolaryngology—Head and Neck Surgery, Turku University Hospital University of Turku Turku Finland
2. Department of Otorhinolaryngology Satakunta Central Hospital Pori Finland
3. Institute of Biomedicine, Division of Infections and Immunity University of Turku Turku Finland
4. Department of Clinical Microbiology Turku University Hospital Turku Finland
5. Department of Pediatrics and Adolescent Medicine, Turku University Hospital University of Turku Turku Finland
6. PEDEGO Research Unit, Medical Research Center University of Oulu Oulu Finland
7. Department of Pediatrics and Adolescent Medicine Oulu University Hospital Oulu Finland