1. Rheumatology Unit, Department of Biotechnological and Applied Clinical Science, School of Medicine, University of L'Aquila, L'Aquila, Italy;
2. Department of Medicine, ASL1 Avezzano-Sulmona-L’Aquila, L’Aquila, Italy;
3. San Salvatore Hospital, UOSD Dermatologia, L’Aquila, Italy;
4. Dermatology Department, Department of Biotechnological and Applied Clinical Science, School of Medicine, University of L'Aquila, L'Aquila, Italy