1. Division of Regenerative Dental Medicine and Periodontology University Clinics of Dental Medicine (CUMD) University of Geneva Geneva Switzerland
2. Department of Periodontology Faculty of Odontology University of Malmö Malmö Sweden
3. Division of Oral Surgery University Clinic of Dentistry Medical University of Vienna Vienna Austria
4. Department of Restorative Dentistry and Periodontology Dublin Dental University Hospital Trinity College Dublin Ireland