1. Department of Biotechnological and Applied Clinical Sciences; University of L'Aquila; L'Aquila; Italy
2. Department of Pathology; San Salvatore Hospital; L'Aquila; Italy
3. Bambino Gesù Children's Hospital; “Istituto di Ricovero e Cura a Carattere Scientifico” (IRCCS); Rome; Italy
4. Department of Clinical Sciences; Section of Rheumatology, Lund University; Lund; Sweden