1. Inouye, S.K., Westendorp, R.G., Saczynski, J.S.: Delirium in elderly people. Lancet 383(9920), 911–922 (2014)
2. Organization World Health, “World report on ageing and health 2016,” Ageing and life-course, September 2016.
http://www.who.int/mediacentre/factsheets/fs404/en/
. Accessed 25 Mar 2015
3. World Health Organization, “Interesting facts about aging,” Media centre, September 2015.
http://www.who.int/ageing/about/facts/
. Accessed 25 Mar 2018
4. World Health Organization, Mental health of older adults, Media centre, December 2017.
http://www.who.int/mediacentre/factsheets/fs381/en/
. Accessed 26 Mar 2018
5. Sotolongo, P.C., Carrillo, P.C., Carrillo, C.C.: Cognitive impairment in the third age. Rev. Cuba. Med. Gen. Integral 20(5–6), 10–15 (2004)