Affiliation: | 1. Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway;2. Department of Pathology, Oslo University Hospital, The Norwegian Radium Hospital, Faculty of Medicine, University of Oslo, Oslo, Norway;3. Department for Otorhinolaryngology, Head and Neck Surgery, Oslo University Hospital, Rikshospitalet, Faculty of Medicine, University of Oslo, Oslo, Norway |