1. Department of Restorative Dentistry and Endodontics, Faculty of Odontology; Université de Lille; Lille France
2. LMCPA; Université de Valenciennes; Valenciennes France
3. Department of Prosthodontics, Faculty of Dentistry; Université de Lille; Lille France
4. Department of Biostatistics; Université de Lille; Lille France
5. Faculty of Medicine; Université de Lille; Lille France