1. Department of Oncology, Lund University Hospital, Lund, Sweden.
2. Department of Otorhinolaryngology and Head and Neck Surgery, University Hospital, Malmö, Sweden.
3. Department of Clinical Sciences, Oncology, Lund University, Lund, Sweden.
4. Department of Radiation Physics, Lund University Hospital, Lund, Sweden.
5. Department of Pathology and Cytology, Lund University Hospital, Lund, Sweden.