1. Service of Preventive Medicine; University Hospital Ramón y Cajal; Madrid Spain
2. National School of Public Health and REDISSEC; Carlos III Institute of Health; Madrid Spain
3. Service of Preventive Medicine; University Hospital La Paz; Madrid Spain
4. EULEN Socio-sanitary Services; Madrid Spain
5. Alzheimer Disease Research Unit and CIBERNED, Alzheimer Center Reina Sofia Foundation; Carlos III Institute of Health; Madrid Spain