1. Department of Periodontology, Faculty of Odontology University of Malmö Malmö Sweden
2. Division of Oral Surgery University Clinic of Dentistry, Medical University of Vienna Vienna Austria
3. Division of Conservative Dentistry and Periodontology University Clinic of Dentistry, Medical University of Vienna Vienna Austria
4. Division of Regenerative Dental Medicine and Periodontology University Clinics of Dental Medicine (CUMD), University of Geneva Geneva Switzerland