1. Department of Internal Medicine and Medical Specialties, University of Rome Sapienza, Rome, Italy.
2. Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy.
3. Department of Clinical and Biological Sciences, University of Turin, Turin, Italy.
4. Endocrinology Unit, IRCCS, Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy.
5. Department of Internal Medicine, University of Perugia, Perugia, Italy.
6. Endocrinology Unit, Azienda Ospedaliera Ospedali Riuniti Villa Sofia-Cervello, Palermo, Italy.
7. Department of Health Sciences, University of Catanzaro, Catanzaro, Italy.
8. Department of Internal Medicine, Institute Jules Bordet, Bruxelles, Belgium.
9. Department of Medical and Pediatric Sciences, University of Catania, Catania, Italy.
10. Endocrinology Unit, Bentivoglio Hospital, Bologna, Italy.
11. Endocrinology Unit, Tinchi-Pisticci Hospital, Matera, Italy.
12. Department of Surgical Sciences, University of Rome Sapienza, Rome, Italy.