1. Department of Otorhinolaryngology - Head and Neck Surgery; University of Helsinki and Helsinki University Hospital; Helsinki Finland
2. Division of Ear, Nose, and Throat Diseases; Department of Clinical Sciences, Intervention and Technology; Karolinska Institutet, Karolinska sjukhuset; Stockholm Sweden
3. Division of Anaesthesiology; Department of Anaesthesiology, Intensive Care, and Pain Medicine; University of Helsinki and Helsinki University Hospital; Helsinki Finland