1. Department of Public Health (C.B., F.B., V.R., J.S., J-Y.R., O.B.), Epidemiology and Health Economics, University of Liège, Liège, Belgium
2. Support Unit in Epidemiology and Biostatistics (C.B., F.B., J.S., J-Y.R., O.B.), University of Liège, Belgium
3. Geriatric Department (S.G., J.P.), CHU Liège, Liège, Belgium
4. Department of Clinical Chemistry (E.C.), University of Liège, CHU Sart-Tilman, Liège, Belgium
5. Bone and Cartilage Metabolism Department (J-Y.R.), CHU Liège, Liège, Belgium
6. Department of Motricity Sciences (O.B.), University of Liège, Liège, Belgium