1. Department of Experimental and Clinical Medicine, Section of Internal Medicine, University of Florence, and Division of Rheumatology, Azienda Ospedaliero-Universitaria Careggi (AOUC), Florence, Italy
2. Department of Internal Diseases, Medical University of Plovdiv, Clinic of Rheumatology, University Hospital ‘Kaspela’, Plovdiv, Bulgaria
3. Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, University of Florence, Florence, Italy
4. Department of Rheumatology and Immunology, Shantou Central Hospital, Shantou, Guangdong, China
5. Rheumatology Department, Waikato Hospital, Hamilton, New Zealand
6. Department of Experimental and Clinical Medicine, Section of Internal Medicine, University of Florence, and Division of High Complexity Medicine, Azienda Ospedaliero-Universitaria Careggi (AOUC), Florence, Italy