1. Leuven University Center for Metabolic Bone Diseases (S.B., D.V.), Katholieke Universiteit Leuven, B-3000 Leuven, Belgium
2. Divisions of Geriatric Medicine (S.B.), Katholieke Universiteit Leuven, B-3000 Leuven, Belgium
3. VU University Medical Center (P.L.), 1007 MB, Amsterdam, The Netherlands
4. Endocrinology (R.B., D.V.), Katholieke Universiteit Leuven, B-3000 Leuven, Belgium
5. Divisions of Aging and Rheumatology, Immunology, and Allergy (H.A.B.-F.), The Robert B. Brigham Arthritis and Musculoskeletal Diseases Clinical Research Center, Brigham and Women’s Hospital, Boston, Massachusetts 02115
6. Department of Orthopaedics and Traumatology (P.H.), Vrije Universiteit Brussel, B-1090 Brussels, Belgium