1. Department of Dental Medicine; Division of Periodontology; Karolinska Institutet; Huddinge Sweden
2. Department of Periodontology; Folktandvården Eastmaninstitutet; Stockholm Sweden
3. Department of Oral and Maxillofacial Diseases; University of Helsinki and Helsinki University Hospital; Helsinki Finland
4. Department of Orofacial Pain and Jaw Function; Faculty of Odontology; Malmö University; Malmö Sweden
5. Department of Periodontology; Faculty of Odontology; Malmö University; Malmö Sweden