Department of Medicine, University Hospital "Príncipe de Asturias", University of Alcalá and Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Alcalá de Henares, 28871 Madrid, Spain.
Immune System Diseases-Rheumatology Service, University Hospital "Príncipe de Asturias", Alcalá de Henares, 28871 Madrid, Spain.