1. Department of Epidemiology, Public Health and Health Economics, University of Liège, Belgium
2. Paris-Descartes University, Cochin Hospital, Department of Rheumatology, Paris, France
3. Polish Center of Osteoporosis, Bialystok, Poland
4. Department of Internal Medicine, University of Torino, Italy
5. INSERM unité 606 and Federation of Rheumatology, Lariboisière Hospital, Paris, France
6. Bone and Mineral Metabolism Service Asturias, Central Hospital, Oviedo, Spain
7. Center for Metabolic Bone Diseases, Istituto Auxologico Italiano, Milan, Italy
8. Clinique Générale-Beaulieu, Geneva, Switzerland