1. Department of Radiological, Oncological and Pathological Sciences, Sapienza University of Rome, Rome 00161, Italy
2. Department of Experimental Medicine, Sapienza University of Rome, Rome 00161, Italy
3. Medical Physics Unit, Policlinico Umberto I, Rome 00161, Italy
4. Department of Clinical Medicine, Clinical Immunology Unit-Scleroderma Center, Sapienza University of Rome, Rome 00161, Italy