1. Upper Airway Research Laboratory, Department of OtorhinolaryngologyGhent University Ghent Belgium
2. Department of Otolaryngology, Supply BaseSaudi Royal Army Taif Saudi Arabia
3. Department of Clinical Science, Intervention and Technology, Division of EarNose and Throat Diseases, Karolinska Institutet Stockholm Sweden
4. Department of Ear, Nose and Throat DiseasesKarolinska University Hospital Stockholm Sweden