1. Department of Health Sciences, University of Florence , Florence, Italy
2. Department of Experimental and Clinical Medicine, University of Florence , Florence, Italy
3. Department of Statistics, Computer Science and Applications G. Parenti, University of Florence , Florence, Italy
4. Immunology, Rheumatology, Allergology and Rare Diseases Unit, San Raffaele Hospital , Milan, Italy
5. Department of Psychiatry and Neuropsychology, Maastricht University , Maastricht, The Netherlands