1. Department of Odontology, Umeå University, Section for Molecular Periodontology, Umeå, Sweden
2. Northern Registry Centre, Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
3. Department of Odontology, Umeå University, Umeå, Sweden
4. Gävle County Hospital, Department of Periodontology, Public Dental Health County Council of Gävleborg, Gävle, Sweden
5. Center for Research and Development Uppsala University/Region Gävleborg, Gävle, Sweden
6. Department of Periodontology, County Council of Västerbotten, Umeå, Sweden
7. Department of Odontology, Umeå University, Section for Clinical Oral Physiology, Umeå, Sweden
8. Lipum AB, Umeå, Sweden
9. Sahlgrenska Ostoporosis Centre, Centre for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden