1 National Center for Epidemiology, Carlos III Institute of Health, Madrid, Spain.
2 Consortium for Biomedical Research in Neurodegenerative Diseases (Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas - CIBERNED), Ministry of Science and Innovation, Madrid, Spain.
3 School of Health Sciences, University of Zaragoza, Zaragoza, Spain.
4 National Center for Epidemiology, Carlos III Institute of Health, Madrid, Spain. jpedro@isciii.es.
5 Consortium for Biomedical Research in Neurodegenerative Diseases (Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas - CIBERNED), Ministry of Science and Innovation, Madrid, Spain. jpedro@isciii.es.
6 Department of Social Services and Family, Aragon Regional Authority, Zaragoza, Spain.