1. Division of Internal Medicine and Cardiovascular Endocrinology, Department of Clinical Medicine and Surgery, University Federico II of Naples , 80131 Naples , Italy
2. Division of Endocrinology and Metabolism, Department of Medicine UConn Health , Farmington, CT 06030-8075 , USA
3. Division of Endocrinology, Metabolism and Gerontology, Stanford University Medical Center , Stanford, CA 94305 , USA