1. University Bordeaux, ISPED; Bordeaux France
2. INSERM, Equipe PPCT, ISPED, Centre INSERM U897-Epidemiologie-Biostatistique; Bordeaux France
3. Donald Berman Maimonides Geriatric Center; McGill University; Montreal Quebec Canada
4. Center for Clinical Epidemiology; Lady Davis Institute, Jewish General Hospital; Department of Epidemiology and Biostatistics; Montreal Quebec Canada
5. Department of Medicine; McGill University; Montreal Quebec Canada