1. Rheumatology Unit, Department of Clinical Medicine and Surgery, University Federico II, Naples, Italy
2. Geriatric Unit, Faculty of Medicine and Psychology, “Sapienza” University of Rome, S. Andrea, Hospital, Rome, Italy
3. Rheumatology, allergology and clinical immunology, Department of System Medicine, University of Rome Tor Vergata, Rome, Italy
4. Department of Medicine and Surgery, University of Milan “Bicocca”, Naples, Italy