1. Endocrinology Division and Thyroid Disease Center, Arcispedale Santa Maria Nuova, Reggio Emilia, Italy.
2. Statistics and Clinical Epidemiology Unit, Arcispedale Santa Maria Nuova, Reggio Emilia, Italy.
3. Department of Diagnostic and Interventional Oncology-Ablative Therapies, Ospedale San Camillo, Rome, Italy.