1. Rheumatology Service, Hospital Universitario La Princesa, IIS-Princesa, 28006 Madrid, Spain
2. Cátedra UAM-Roche, EPID-Future, Department of Medicine, Autonomous University of Madrid (UAM), 28049 Madrid, Spain
3. Geriatric Service, Hospital Universitario Severo Ochoa, Leganés, 28914 Madrid, Spain
4. Rheumatology Service, Hospital General Universitario de Móstoles, Móstoles, 28935 Madrid, Spain
5. Rehabilitation Service, Hospital Universitario Ramón y Cajal, 28034 Madrid, Spain
6. Primary Care Center Zulema, Alcalá de Henares, 28810 Madrid, Spain
7. Endocrinology Service, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain
8. Spine Unit, Hospital Universitario Fundación Jiménez Díaz, 28040 Madrid, Spain