1. Institute of Dentistry; University of Eastern Finland; Kuopio Finland
2. Department of Oral Diseases; Turku University Central Hospital; Turku Finland
3. Institute of Dentistry; University of Helsinki; Helsinki Finland
4. Helsinki University Central Hospital; Helsinki Finland
5. Research Unit of Oral Health Sciences; University of Oulu; Finland
6. Oral and Maxillofacial Department; Medical Research Center Oulu; Oulu University Hospital; Oulu Finland
7. Department of Orofacial Pain and Jaw Function; Malmö University; Malmö Sweden
8. Institute of Dentistry; University of Turku; Turku Finland
9. Oral and Maxillofacial Department; Kuopio University Hospital; Kuopio Finland