1. Department of Endocrinology (Y.E.C.T., B.L., G.V., V.B., J.-M.K.), Ghent University Hospital and Unit for Osteoporosis, Ghent University, 9000 Ghent, Belgium
2. Metabolic Bone Disease (B.L., H.Z., S.G., J.-M.K.), Ghent University Hospital, Ghent University, 9000 Ghent, Belgium
3. Department of Public Health (D.D.B.), Ghent University, 9000 Ghent, Belgium