1. Unit of Endocrinology, Scientific Institute Casa Sollievo della Sofferenza, S. Giovanni Rotondo, Italy.
2. Department of Clinical Sciences, Sapienza University, Rome, Italy.
3. Unit of Endocrinology, Cervello Hospital, Palermo, Italy.
4. Department of Biomedical Sciences, University of Catania, Catania, Italy.
5. Unit of Endocrinology, Tinchi-Pisticci Hospital, Matera, Italy.
6. Unit of Thoracic Surgery, Scientific Institute Casa Sollievo della Sofferenza, S. Giovanni Rotondo, Italy.
7. Unit of Nuclear Medicine, Scientific Institute Casa Sollievo della Sofferenza, S. Giovanni Rotondo, Italy.
8. Unit of Endocrinology, Bentivoglio Hospital, Bologna, Italy.
9. Casa Sollievo della Sofferenza-Mendel Institute, Rome, Italy.