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