1. Department of Clinical and Experimental Medicine, Unit of Endocrinology, Pisa University Hospital , Pisa 56124 , Italy
2. Department of Surgical, Medical, Molecular Pathology and Critical Area, Unit of Endocrine Surgery, Pisa University Hospital , Pisa 56126 , Italy
3. Department of Surgical, Medical, Molecular Pathology and Critical Area, Anatomic Pathology Section, Pisa University Hospital , Pisa 56126 , Italy