1. Department of Otorhinolaryngology, Institute of Clinical Sciences Sahlgrenska Academy at the University of Gothenburg, Sahlgrenska University Hospital Gothenburg Sweden
2. Department of Oral and Maxillofacial Surgery, Institute of Clinical Sciences Sahlgrenska Academy at the University of Gothenburg Gothenburg Sweden
3. Clinic of Orofacial Pain Sahlgrenska Academy and Public Dental Health Gothenburg Sweden