1. Department of Rheumatology, Elda University Hospital, Elda, Alicante, Spain
2. Research Unit (UI), Spanish Society of Rheumatology (SER), Madrid, Spain
3. Department of Rheumatology, University Hospitalof Palencia, Palencia, Spain
4. Department of Rheumatology, Puerta del Mar University Hospital, Cádiz, Spain
5. Department of Rheumatology, Navarra Hospital, Pamplona, Spain
6. Department of Rheumatology, Asturias Central University Hospital, Oviedo, Spain
7. Department of Rheumatology, Our Lady of Candelaria University Hospital, Santa Cruz, Spain
8. Department of Rheumatology, University Hospital of the Canary Islands, La Laguna, Santa Cruz, Spain
9. Department of Medicine, University of La Laguna, La Laguna, Santa Cruz, Spain