1. Endocrinology and Metabolism, Vita-Salute San Raffaele University, Milano, Italy
2. McGuire Veterans Affairs Medical Center and Virginia Commonwealth University School of Medicine, Richmond, Virginia
3. Osteoporosis Clinical Research Program and Institute on Aging, University of Wisconsin-Madison, Madison, Wisconsin
4. Department of Chronic Diseases, Metabolism and Ageing, Laboratory of Clinical and Experimental Endocrinology, Katholieke Universiteit Leuven, Leuven, Belgium
5. Department of Medicine, School of Clinical Sciences, Monash University, Clayton, Victoria, Australia
6. Division of Endocrinology, Escola Paulista de Medicina, Universidade Federal de Sao Paulo, Sao Paulo, Brazil
7. Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
8. Division of Bone Diseases, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland
9. Department of Population Health Sciences, University of Wisconsin-Madison, Madison, Wisconsin
10. Endocrinology Division, Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York