1. Department of Biomaterials Institute of Clinical Sciences The Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
2. Department of Oral Biochemistry Institute of Odontology The Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
3. The Public Dental Health Service Competence Centre of Northern Norway Tromsø Norway
4. Department of Periodontology Institute of Odontology The Sahlgrenska Academy, University of Gothenburg Gothenburg Sweden
5. Department of Clinical Dentistry Faculty of Health Sciences UiT the Arctic University of Norway Tromsø Norway
6. Clinic of Periodontology The Public Dental Service Region Västra Götaland Skövde Sweden
7. Department of Medical Biology Faculty of Health Sciences UiT the Artic University of Norway Tromsø Norway
8. Department of Oral and Craniofacial Sciences School of Dental Medicine University of Pittsburgh Pittsburgh Pennsylvania USA
9. School of Public Health and Community Medicine Institute of Medicine The Sahlgrenska Academy at University of Gothenburg Gothenburg Sweden