1. Department of Clinical and Experimental Medicine, Unit of Endocrinology, University Hospital of Pisa, Pisa, Italy
2. Phoenix Epidemiology and Clinical Research Branch National Institute of Diabetes and Digestive and Kidney Disease, National Institutes of Health, Phoenix, Arizona
3. Department of Surgical, Medical, Molecular Pathology and Critical Area, Anatomic Pathology Section, University Hospital of Pisa, Pisa, Italy