1. Endocrinology Section, Department of Clinical and Experimental Medicine, Garibaldi Nesima Hospital, University of Catania, Catania, Italy
2. Unit of Endocrinology, University Hospital of Messina, Messina, Italy
3. Department of Human Pathology DETEV, University of Messina, Messina, Italy
4. Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
5. Unit of Nuclear Medicine, Department of Biomedical and Dental Sciences and Morpho-Functional Imaging, University of Messina, Messina, Italy
6. Clinic for Nuclear Medicine and Competence Centre for Thyroid Diseases, Imaging Institute of Southern Switzerland, Ente Ospedaliero Cantonale, Bellinzona, Switzerland