1. Department of Periodontology U.F.R. d’Odontologie‐Garanciere Université de Paris Paris France
2. Department of Periodontology Service d’Odontologie AP‐HP, Rothschild Hospital Paris France
3. Inserm, Population‐based Epidemiologic Cohorts Unit, UMS 011 Villejuif France
4. Université de Paris, UR 2496 Paris France
5. KU Leuven Department of Oral Health Sciences & UZ Leuven Restorative Dentistry Campus Sint‐Rafaël Leuven Belgium
6. KU Leuven Libraries 2Bergen Désiré Collen Learning Centre Leuven Belgium