1 Department of Medicine, Rheumatology Clinic, S. Chiara Hospital, Trento, Italy.
2 Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.
3 Nephrology and Dialysis Unit, Department of Biomedical, Experimental and Clinical Sciences "Mario Serio", Meyer Children's Hospital, University of Firenze, Viale Pieraccini 6, 50139, Florence, Italy. [email protected].