1. Rheumatology Unit, Department of Medicine, University of Perugia, Perugia, Italy
2. Rheumatology Unit, Department of Biotechnological and Applied Clinical Science, School of Medicine, University of L’Aquila, L’Aquila, Italy
3. Department of Medicine, ASL 1 Avezzano Sulmona L’Aquila, L’Aquila, Italy