1. Center for Musculoskeletal Research; Leuven University; Leuven; Belgium
2. Oregon Health & Science University; Portland; Oregon
3. Department of Epidemiology and Preventive Medicine; University of Maryland School of Medicine; Baltimore; Maryland
4. Duke University Medical Center; Durham; North Carolina
5. Division of Rheumatology; Department of Medicine; McMaster University; Hamilton; Ontario; Canada
6. Novartis Pharmaceuticals; East Hanover; New Jersey
7. Center for Outcomes Research; Laboratory for Experimental Surgery; Universitair Ziekenhuis Brussel; Vrije Universiteit Brussel; Brussels; Belgium
8. Unit for Osteoporosis and Metabolic Bone Diseases; Ghent University Hospital; Ghent; Belgium
9. Division of Traumatology; Leuven University; Leuven
10. Division of Orthopedic Surgery; Ziekenhuis Oost-Limburg; Genk
11. Center for Health Services and Nursing Research; Leuven University; Leuven; Belgium