1. Department of Rheumatology, Hospital of Bruneck, Bruneck, Italy
2. Rheumatology Clinic, Department of Medicine, University of Udine, c/o Azienda Sanitaria Universitaria Friuli Centrale, Udine, Italy
3. Division of Rheumatology and Immunology, Medical University Graz, Graz, Austria
4. Department of Rheumatology, University Medical Centre Ljubljana, Ljubljana, Slovenia
5. Division of Musculoskeletal and Rheumatic Diseases, Instituto Nacional de Rehabilitacion, Mexico City, Mexico
6. Rheumatology Center of Excellence, Mexico City, Mexico
7. Rheumatology Clinic, Department of Medicine, University of Udine, c/o Azienda Sanitaria Universitaria Friuli Centrale, Piazzale Santa Maria della Misericordia 15, 33100 Udine, Italy