1. Department of Oral and Maxillofacial Surgery Institute of Dentistry University of Turku Turku Finland
2. Department of Oral and Maxillofacial Diseases Turku University Hospital Turku Finland
3. Department of Health National Institute for Health and Welfare Turku Finland
4. Pain Clinic Department of Anaesthesiology, Intensive Care and Pain MedicineHelsinki University Hospital and University of Helsinki Helsinki Finland