1. Rheumatology Unit, Department of Experimental and Internal Medicine, University of Messina, 98124 Messina, Italy
2. Department of Internal Medicine, University of Genova, 16132 Genova, Italy
3. IRCCS Ospedale Policlinico San Martino, 16132 Genova, Italy
4. School and Operative Unit of Allergy and Clinical Immunology, Department of Clinical and Experimental Medicine, University of Messina, 98125 Messina, Italy