1. Department of Radiological Sciences, Oncology and Anatomo-Pathology, Sapienza University of Rome, Rome, Italy
2. Department of Public Health and Infectious Diseases, Sapienza University of Rome, Rome, Italy
3. Department of Economics
& Finance, University of Rome "Tor Vergata", Rome, Italy
4. Unit of Nuclear Medicine, Department of Medical,
Surgical and Experimental Sciences, University of Sassari, Sassari, Italy