1. Faculty of Dentistry, McGill University, Montreal, QC, Canada
2. Epidemiology and Biostatistics Unit, Institut Armand-Frappier, INRS, Laval, QC, Canada
3. Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, QC, Canada
4. MRC Unit for Lifelong Health and Ageing at UCL, University College London, London, UK