1. Faculty of Medicine and Health Örebro University Örebro Sweden
2. Department of Otolaryngology Örebro University Hospital Örebro Sweden
3. Department of Biomaterials, Institute of Clinical Sciences, Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
4. Department of Otorhinolaryngology NU Hospital Group Trollhättan Sweden
5. Clinical Epidemiology and Biostatistics, School of Medical Sciences, Faculty of Medicine and Health Örebro University Örebro Sweden
6. Department of Otolaryngology Vasteras Hospital Västerås Sweden
7. Centre for Clinical Research, Vastmanland Hospital Vasteras Region Vastmanland – Uppsala University Västerås Sweden
8. Department of Clinical Sciences, Otorhinolaryngology Umeå University Umeå Sweden
9. Department of Surgical Sciences, Otorhinolaryngology Uppsala University Uppsala Sweden
10. MU ENT, H&B, Karolinska University Hospital, Stockholm, Sweden Department of CLINTEC, Division of Ear, Nose and Throat Diseases Karolinska Institutet Stockholm Sweden