1. Department of Surgery and Translational Medicine, University of Florence, University Hospital of Florence, Florence, Italy
2. Department of Medicine, University of Verona, Verona, Italy
3. Department of Urology, University of Florence, University Hospital of Florence, Largo Brambilla Florence, Italy
4. Centre for Metabolic Bone Diseases, University of Sheffield, Sheffield, United Kingdom
5. Department of Urology, University of Naples Federico II, Naples, Italy
6. Department of Urology, S Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy
7. Department of Public Health, Epidemiology and Health Economics, University of Liege, CHU Sart-Tilman, Liege, Belgium
8. Service of Bone Diseases, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland