1. Marques de Valdecilla University Hospital; Sandanter Spain
2. Service of Preventive Medicine; University Hospital Ramón y Cajal; Madrid Spain
3. National Distance Education University (UNED); Madrid Spain
4. Carlos III Institute of Health; Madrid Spain
5. Center for Human and Social Sciences, Spanish National Research Council; Madrid Spain
6. Alzheimer Center Reina Sofia Foundation; Alzheimer Disease Research Unit, CIEN Foundation, Carlos III Institute of Health; Madrid Spain
7. REDISSEC; Madrid Spain