1. Department of Restorative Dentistry, Periodontology, Endodontology and Preventive and Pediatric Dentistry University Medicine Greifswald Greifswald Germany
2. Institute of German Dentists (IDZ) Cologne Germany
3. Department of Periodontology The Institute for Postgraduate Dental Education, Region Jönköping County Jönköping Sweden
4. Centre for Oral Health, School of Health and Welfare Jönköping University Jönköping Sweden
5. Futurum, Academy for Health and Care, Region Jönköping County and Department of Social Work School of Health and Welfare, Jönköping University Jönköping Sweden
6. Institute for Community Medicine University Medicine Greifswald Greifswald Germany