1. Pituitary Diseases and Sodium Alterations Unit, AOU Careggi, 50139 Florence, Italy
2. Endocrinology, Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Florence, AOU Careggi, 50139 Florence, Italy
3. Gastroenterology Unit, Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Florence, 50139 Florence, Italy
4. Central Laboratory, Careggi University Hospital, 50139 Florence, Italy