1. ETEP (Etiolgy and Therapy of Periodontal Diseases) Research Group; University Complutense; Madrid Spain
2. King's College London School of Medical Education; London UK
3. Microbiology; Barts and The London School of Medicine and Dentistry; Queen Mary University of London; London UK
4. Piracicaba Dental School; UNICAM; Piracicaba SP Brazil
5. Department of Dentistry and Oral Health; Faculty of Health; Aarhus Universitet; Aarhus C Denmark
6. Charite; Berlin Germany
7. Manchester University; Manchester UK
8. Oral Rehabilitation; University of Talca; Talca Chile
9. University of Minnesota School of Dentistry; Minneapolis MN USA
10. Periodontology; University of Turku; Turku Finland
11. Department of Oral Biology; School of Dentistry; University of Leeds; Leeds UK
12. Periodontology; University of Giessen; Giessen Germany
13. Centre for Advanced Research in Public Health; FISABIO Foundation; Valencia Spain
14. Periodontology; University of Geneva; Geneva Switzerland
15. Katholieke Universiteit Leuven; Leuven Belgium
16. Oral Health Cooperative Research Centre; Melbourne Dental School; The University of Melbourne; Melbourne Australia
17. Periodontology; Hebrew University and Hadassah Medical Center; Jerusalem Israel
18. Department of Preventive Dentistry; Academic Centre for Dentistry Amsterdam (ACTA); Amsterdam The Netherlands