1. ETEP (Etiology and Therapy of Periodontal and Peri‐implant Diseases) Research Group University Complutense of Madrid Madrid Spain
2. Department of Periodontology, Faculty of Dental Medicine Hadassah and the Hebrew University Medical Center Jerusalem Israel
3. Biomedical Research Institute Sant Pau (IIB Sant Pau) Sardenya Primary Health Care Center Barcelona Spain
4. Periodontal Research Group, Institute of Clinical Sciences, College of Medical & Dental Sciences The University of Birmingham Birmingham UK
5. Birmingham Community Healthcare NHS Foundation Trust Birmingham UK
6. Medizinische Fakultät der Martin‐Luther‐Universität Halle‐Wittenberg Institut für Allgemeinmedizin Halle (Saale) Germany
7. Department of Surgical, Medical and Molecular Pathology and Critical Care Medicine, School of Dentistry University of Pisa Pisa Italy
8. Oxford Primary Care, Radcliffe Primary Care Building, ROQ University of Oxford Oxford UK
9. Dental Faculty University of Strasbourg Strasbourg France
10. Department of General Practice and Family Medicine University Medical Center Göttingen Göttingen Germany
11. Department of Periodontology, Operative and Preventive Dentistry University Hospital Bonn Bonn Germany
12. Dr. Odinaka's Clinic Bodø Norway
13. Department of Periodontology, Faculty of Dentistry National and Kapodistrian University of Athens Athens Greece
14. Department of Family Medicine Ankara University School of Medicine Ankara Turkey
15. Department of Medicine University of Vic – Central Catalonia University. Vic Barcelona Spain
16. Primary Health Care Service Althaia Foundation – Healthcare and University Network Manresa Spain
17. Department of Family Medicine Jagiellonian University Medical College Krakow Poland
18. Department of Family Medicine, Sackler Faculty of Medicine Tel Aviv University Tel Aviv Israel