1. Alzheimer Center Reina Sofia Foundation and CIBERNED; Carlos III Institute of Health; Madrid Spain
2. National Center of Epidemiology and CIBERNED; Carlos III Institute of Health; Madrid Spain
3. National School of Public Health and REDISSEC; Carlos III Institute of Health; Madrid Spain
4. CIREN; La Habana Cuba
5. Hospital Ramos Mejia; Buenos Aires Argentina
6. Donostia Hospital, Biodonostia Institute and CIBERNED; San Sebastian Spain
7. Institute of Neurosciences, Favaloro University; INECO; Buenos Aires Argentina
8. Hospital Ruber Internacional; Madrid Spain
9. Hospital Ramon y Cajal; IRYCIS; Madrid Spain
10. Complejo Asistencial de Segovia; Segovia Spain
11. University of Miami; Miami FL USA
12. Instituto Nacional de Neurologia y Neurocirugia; Mexico DF Mexico
13. University of Texas School of Public Health at Houston; Houston TX USA
14. Rush University Medical Center; Chicago IL USA