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. Midwifery Research and Education Unit, Hannover Medical School Hannover Germany
4. Division of Conservative Dentistry and Periodontology University Clinic of Dentistry, Medical University of Vienna Vienna Austria
5. Division of Regenerative Dentistry and Periodontology University Clinics of Dental Medicine (CUMD), University of Geneva Geneva Switzerland