1. a Department of Internal Medicine, University of Rome “Tor Vergata,” Rome, Italy;
2. c Endocrinology Unit, National Institute of Cancer “Regina Elena,” Rome, Italy;
3. b Department of Neuroscience, University of Rome “Tor Vergata,” Rome, Italy;
4. d Pituitary Center, Division of Endocrinology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA;
5. e Endocrinology Unit, Università Cattolica, Rome, Italy