1. Metabolic Bone Diseases Unit; Division of Endocrinology, Department of Medicine, College of Physicians and Surgeons; Columbia University; New York NY USA
2. Department of Medicine; University of Manitoba; Winnipeg Canada
3. Medical Department II, St. Vincent Hospital Vienna; Academic Teaching Hospital of the Medical University Vienna; Vienna Austria
4. Center of Bone Diseases; Lausanne University Hospital; Lausanne Switzerland
5. Department of Family Medicine; Ural State Medical Academy; Yekaterinburg Russian Federation
6. Osteoporosis Clinical Research Program; University of Wisconsin; Madison WI USA
7. University of Sheffield; Metabolic Bone Centre; Northern General Hospital Sheffield United Kingdom
8. WHO Collaborating Centre for Metabolic Bone Diseases; University of Sheffield; Sheffield United Kingdom