1. Department of Otorhinolaryngology, The First Affiliated Hospital of Sun Yat-sen University, Sun Yat-sen University, Guangzhou, China
2. Upper Airway Research Laboratory, Ghent University Hospital, Ghent, Belgium
3. Department of Otorhinolaryngology, Head and Neck Surgery, University of Muenster, Muenster, Germany
4. Division of ENT diseases, Stockholm, Sweden