See related article, p 2256. Cognitive impairment or dementia is one of the most frequent causes of disability in the elderly. A recent metaanalysis reports global prevalence of dementia from all causes to be between 5% and 7% of adults of age >60 years. It doubles every 5 years and reaches >30% at the age of 90 years in the most regions of world. Dementia has become a significant economic burd...
