1. Dental School, University of Toulouse III; Department of Dental Public Health / Epidemiology; 3, Chemin des Maraichers Toulouse France 31069
2. Dental School, University of Toulouse III; Dental Public Health / Epidemiology; 3, chemin des maraîchers Toulouse France 31400
3. Rangueil University Hospital; Department of Rheumatology; CHU Rangueil Toulouse France 31403
4. School of Dentistry, The University of Manchester; Cochrane Oral Health Group; Coupland III Building, Oxford Rd Manchester UK M13 9PL