1. Skin and Allergy Hospital, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
2. Meilahti Hospital Emergency Department, Helsinki University Hospital, Helsinki, Finland
3. Department of Otorhinolaryngology – Head and Neck Surgery, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
4. Department of Ear and Oral Diseases, Tampere University Hospital, Tampere, Finland
5. Department of Otorhinolaryngology, University of Eastern Finland and Kuopio University Hospital, Kuopio, Finland