1. Department of Medicine and Medical Specialities, University of Alcala, Crta N-II km 33.6, 28871 Alcala de Henares, Spain
2. Ramón y Cajal Institute of Sanitary Research (IRYCIS), 28034 Madrid, Spain
3. Service of Rehabilitation, National Hospital for Paraplegic Patients, Carr. de la Peraleda, S/N, 45004 Toledo, Spain
4. Immune System Diseases-Rheumatology Service and Internal Medicine, Prince of Asturias University Hospital (CIBEREHD), 28806 Alcala de Henares, Spain