1. http://en.wikipedia.org/wiki/Life_expectancy
2. https://www.cia.gov/library/publications/the-world-factbook/rankorder/2102rank.html
3. http://www.un.org/esa/population/publications/wpp2002/WPP2002-HIGHLIGHTSrev1.PDFUN
4. http://www.alz.co.uk/research/WorldAlzheimerReport2013ExecutiveSummary.pdf
5. Epidemiology of Parkinson's disease;de Lau;Lancet Neurol,2006