1. Periodontal Research Group; The University of Birmingham; Birmingham UK
2. Department of Periodontology; Service of Odontology; Rothschild Hospital; AP-HP, Paris 7-Denis Diderot University; U.F.R. of Odontology; Paris France
3. EA 2496; Paris 5-Descartes University; U.F.R. of Odontology; Paris France
4. WHO Collaboration Centre for Epidemiology and Community Dentistry; Milan Italy
5. Department of Surgery, Microsurgery and Medicine Sciences; School of Dentistry; Universita degli Studi di Sassari; Sassari Italy
6. INSERM; U1018; Villejuif; France
7. Centre for Oral Clinical Research; Institute of Dentistry; Barts and The London School of Medicine and Dentistry; Queen Mary University London (QMUL); London UK
8. Public Health Sciences; University of Washington; Seattle WA USA
9. Department of Periodontology; Academic Centre for Dentistry in Amsterdam; Amsterdam the Netherlands
10. Department of Cariology; Institute of Odontology; Gothenburg Sweden
11. Melbourne Dental School; University of Melbourne; Parkville Vic. Australia
12. Faculty of Dentistry; Universidad Complutense de Madrid; Madrid Spain
13. Dental Innovation and Translation Centre; Dental Institute; Kings College London; London UK
14. Division for Cariology; Department of Operative Dentistry and Periodontology; Center for Dental Medicine; University Medical Center; Albert-Ludwig-University; Freiburg Germany
15. Periodontology; K. U. Leuven; Leuven Belgium
16. Faculty of Health and Medical Sciences; School of Dentistry; Section of Cariology and Endodontics; University of Copenhagen; Copenhagen Denmark
17. Department of Cariology; Academic Centre for Dentistry Amsterdam; Amsterdam the Netherlands
18. Oral Biology; University of Pittsburgh; Pittsburgh PA USA
19. Department of Special Care Dentistry; Dental School; Witten/Herdecke University; Witten Germany