1. Department of Medical Sciences and Public Health, University of Cagliari , Monserrato, Italy
2. Rheumatology Unit, Azienda Ospedaliero-Universitaria di Cagliari , Monserrato, Italy
3. University of Barcelona, Department of Autoimmune Diseases, Hospital Clinic, Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS) , Barcelona, Catalonia, Spain
4. Rheumatology Unit, University of Bari , Bari, Italy
5. Hospital Santo Antonio Centro Hospitalar do Porto, Unidade de Imunologia Clinica , Porto, Portugal
6. Rheumatology, Clinical Immunology and Allergy Unit, University of Crete , Heraklion, Greece
7. Fourth Department of Internal Medicine, School of Medicine, Hippokration Hospital , Thessaloniki, Greece
8. Rheumatology Unit, University of Siena , Siena, Italy
9. Rheumatology Unit, AOU, S. Anna, University of Ferrara , Ferrara, Italy
10. Ophthalmology Unit, Department of Medicine, Surgery and Neurosciences, University of Siena , Siena, Italy
11. UMIB Abel Salazar Biomedical Sciences Institute, University of Porto , Porto, Portugal