Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, 00029 HUH, Helsinki, Finland. aleksi.haapanen@hus.fi.
European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery