1. United Nations (2015) World population ageing 2015. Department of economic and social affairs population division, New York, United Nations. http://www.un.org/en/development/desa/population/publications/pdf/ageing/WPA2015_Report.pdf . Accessed 23 Jan 2017
2. National Institute on Aging (2007) Why population aging matters: a global perspective. NIH publication. Bethesda, Maryland, USA. https://www.nia.nih.gov/sites/default/files/WPAM.pdf . Accessed 23 Jan 2017
3. World Health Organization (2011) Global health and aging. NIH publication, Bethesda, Maryland, USA. https://www.nia.nih.gov/sites/default/files/global_health_and_aging.pdf . Accessed 23 Jan 2017
4. National Institute on Aging (2016). Alzheimer’s Disease Fact Sheet, NIH Publication No. 16-AG-6423, Bethesda, Maryland, USA. https://www.nia.nih.gov/alzheimers/publication/alzheimers-disease-fact-sheet . Accessed 23 Jan 2017
5. Hao J, Gaboury S, Bouchard B (2016) Cognitive errors detection: Mining behavioral data stream of people with cognitive impairment. In: Pervasive technologies related to assistive environments. ACM, New York, pp 15:1–15:8