1. Unit of Endocrinology, Dipartimento di Medicina Clinica e Chirurgia, Federico II University Medical School of Naples, Naples, Italy;
2. Oncological Endocrinology Unit, Department of Medical Sciences, University of Turin, AOU Città della Salute e della Scienza di Torino, Turin, Italy;
3. Unit of Endocrinology, Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy;
4. Endocrinology Unit, Department of Oncology and Medical Specialities, A.O. San Camillo-Forlanini, Rome, Italy;
5. Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy;
6. Department of Medical Oncology, Fondazione IRCCS Istituto Nazionale Tumori Milano, ENETS Center of Excellence, Milan, Italy;
7. Endocrinology and Diabetology Unit, ASL Verbano Cusio Ossola, Domodossola, Italy;
8. Digestive and Liver Disease Unit, S. Andrea Hospital, Faculty of Medicine and Psychology, Sapienza University of Rome, Rome, Italy;
9. Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy