Acknowledgements ML was recipient of a fellowship from the University of Lleida. This work was supported by grants to the University of Lleida (JF, principal investigator) from Fondo de Investigacio´n Sanitaria (FIS, PI051778) and Ministerio de Cie´ncia e Innovacio´n (CGL 2007-62875). We thank Elaine Lilly, Ph.D. (Writer’s First Aid), for English language revision of the manuscript. We would like to thank the elderly participants and their families, who made this study possible.

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