1. Department of Otorhinolaryngology, Östersund Hospital, Östersund, Sweden;
2. Department of Otorhinolaryngology, Ryhov County Hospital and Futurum– the Academy for Health and Care, County Council, Jönköping, Sweden;
3. School of Health Sciences, Faculty of Medicine and Health, Örebro University, Örebro, Sweden;
4. Sollentuna Specialist Clinic, Stockholm, Sweden;
5. Department of Otorhinolaryngology, Cityakuten, Stockholm, Sweden;
6. Division of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden;
7. Department of Otorhinolaryngology, Karolinska University Hospital, Stockholm, Sweden;
8. Department of Otorhinolaryngology, Södra Älvsborgs Hospital, Borås, Sweden;
9. Institute of Clinical Sciences, Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden;
10. Department of Clinical Sciences, Otorhinolaryngology, Umeå University, Umeå, Sweden;
11. Sheikh Khalifa Medical City, Ajman, United Arab Emirates