1. Department of Rheumatology, IdiPAZ, Hospital Universitario La Paz, Madrid, Spain
2. Arthritis Unit, Department of Rheumatology, Hospital Clinic de Barcelona and IDIBAPS, Barcelona, Spain
3. Department of Rheumatology, Hospital Marina Baixa, Villajoyosa, Alicante, Spain
4. Biostatistics, Pfizer España, Madrid, Spain
5. Medical Affairs, Pfizer España, Madrid, Spain
6. Inflammation Rheumatology, Medical Department, Pfizer SLU, Madrid, Spain