1. Department of Periodontology School of Dentistry CHU Lille Univ. Lille Lille France
2. Department of Restorative Dentistry and Endodontics School of Dentistry CHU Lille Univ. Lille Lille France
3. EA 2694 ‐ Public Health: Epidemiology and Quality of Care CHU Lille Univ. Lille Lille France
4. Private Practice Dunkerque France
5. Department of Dental Public Health School of Dentistry CHU Lille, Univ. Lille Lille France