1. Upper Airway Research Laboratory, Department of Otorhinolaryngology, Ghent University Hospital, Ghent, Belgium
2. Department of Otorhinolaryngology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
3. Department of Otorhinolaryngology, Siriraj Rhino and Allergy Clinic, Mahidol University Hospital, Bangkok, Thailand
4. Department of Pathology, Ghent University Hospital, Ghent, Belgium
5. Department of Otorhinolaryngology–Head and Neck Surgery, University Hospital Leuven, Leuven, Belgium
6. Division of Ear, Nose, and Throat Diseases, Clintec, Karolinska Institutet, Stockholm, Sweden