1. Department of Conservative Dentistry and Periodontology Center of Dental Traumatology University Hospital of Würzburg Würzburg Germany
2. Department of Periodontology, Endodontology and Cardiology University School of Dental Medicine BaselSwitzerland
3. Center of Dental Traumatology University School of Dental Medicine BaselSwitzerland
4. Department of Oral Surgery University School of Dental Medicine BaselSwitzerland
5. Department of Paediatric Dentistry Clinic for Orthodontics and Paediatric Dentistry University of Zürich Zürich Switzerland
6. University Clinic of Dental Medicine and Oral Health Medical University Graz Graz Austria
7. Private Practice Purmerend Netherlands
8. Department of Conservative Dentistry and Periodontology University Hospital Regensburg Regensburg Germany
9. Department of Oral and Maxillofacial Diseases Helsinki University Hospital University of Helsinki HelsinkiFinland
10. Research Unit of Oral Health Sciences Medical Research Center Oulu (MRC Oulu) Oulu University Hospital University of Oulu Oulu Finland
11. School of Dentistry College of Biomedical and Life Sciences Cardiff University Cardiff UK