1. Endocrinology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy.
2. Pathology Unit, Department of Surgical, Medical, Molecular Pathology and Critical Area, University of Pisa, Pisa, Italy.
3. Laboratory of Chemistry and Endocrinology, University Hospital of Pisa, Pisa, Italy.
4. Department of Medicine and Surgery, University of Insubria, Varese, Italy.