1. Department of OtorhinolaryngologyInstitute of Clinical Sciences, Sahlgrenska Academy at the University of Gothenburg, Sahlgrenska University Hospital Gothenburg Sweden
2. Clinic of Orofacial PainSahlgrenska Academy and Public Dental Health Gothenburg Sweden
3. Department of Oral and Maxillofacial SurgeryInstitute of Clinical Sciences, Sahlgrenska Academy at the University of Gothenburg Gothenburg Sweden