1. Unit for Bone Metabolism Diseases and Diabetes and Lab of Endocrine and Metabolic Research, IRCCS Instituto Auxologico Italiano, Milan, Italy
2. Department of Medical Science and Community Health, University of Milan, Milan, Italy
3. Department of Clinical and Experimental Medicine, University of Messina, University Hospital “G. Martino”, Messina, Italy
4. Department of Medicine, Surgery and Neurosciences, University of Siena, Policlinico Le Scotte, Siena, Italy
5. Department of Clinical and Experimental Medicine, University of Catania, University Hospital “G. Rodolico”, Catania, Italy