1. Rheumatology Department, Hospital Universitario La Paz , Madrid, Spain
2. Department of Rheumatology, IRCCS-S.Maria Nuova , Reggio Emilia, Italy
3. Rheumatology Unit, Department of Medicine, Surgery and Neurosciences, University of Siena , Siena, Italy
4. Unit of Immunology, Rheumatology Department, Allergy and Rare Diseases (UnIRAR), San Raffaele Scientific Institute , Milan, Italy
5. Rheumatology Department, Medical University of Plovdiv, University Hospital Kaspela , Plovdiv, Bulgaria
6. Department of Rheumatology, IRCCS Policlinico S Matteo Fondazione, University of Pavia , Pavia, Italy
7. Rheumatology Department, Hospital de Santa Maria, Centro Hospitalar Universitario Lisboa Norte EPE , Lisboa, Portugal
8. Department of Rheumatology, University Medical Centre Ljubljana , Ljubljana, Slovenia