1. Division of Medicine, Department of Inflammation, Centre for Rheumatology and Connective Tissue Diseases, Royal Free Campus, University College London, London, UK
2. Unit of Immunology, Rheumatology, Allergy and Rare Diseases (UnIRAR), IRCCS San Raffaele Hospital, Vita-Salute San Raffaele University, Milan, Italy
3. Department of Experimental and Clinical Medicine, Division of Rheumatology, University of Florence, Florence, Italy
4. Centre for Experimental Rheumatology, University Hospital of Zurich, Zurich, Switzerland
5. Academic Rheumatology Centre, Università degli Studi di Torino, Turin, Italy