1 Rheumatology Division, Hospital de La Princesa, IIS-Princesa, Universidad Autónoma de Madrid, Madrid, Spain.
2 Division of Rheumatology, University and IRCCS Policlinico S Matteo Foundation, Pavia, Italy.
3 Rheumatology Division and Epidemiology, University of Cantabria, Genetics and Atherosclerosis Research Group on Systemic Inflammatory Diseases, Hospital Universitario Marqués de Valdecilla, Santander, Cantabria, Spain.