Affiliation: | 1. Departments of Otorhinolaryngology, Head and Neck Surgery, University of Helsinki, Helsinki University Hospital, Helsinki, Finland;2. Department of Gastrointestinal Surgery, University of Helsinki, Helsinki University Hospital, Helsinki, Finland;3. Division of Ear Nose and Throat Diseases, Department of Clinical Sciences, Intervention and Technology, Karolinska Institute and Karolinska Hospital, Stockholm, Sweden;4. Department of Biosciences and Nutrition, Karolinska Institutet, Stockholm, Sweden |