1. United Nations Department of Economics and Social Affairs, Population Division, Population Estimates and Projections Section. World Population Prospects: The 2012 Revision [Internet]. Available from: http://esa.un.org/wpp/ [cited 14.06.13].
2. The World Bank. GDP (current US$) [Internet]. Available from: http://data.worldbank.org/indicator/NY.GDP.MKTP.CD [cited 15.04.13].
3. WHO (World Health Statistics) [Internet]. WHO. Available from: http://www.who.int/gho/publications/world_health_statistics/en/index.html [cited 28.10.13].
4. Global Health Expenditure Database [Internet]. Geneva, Switzerland: World Health Organization; Available from: http://apps.who.int/nha/database/DataExplorerRegime.aspx.
5. Global estimates of diabetes prevalence for 2013 and projections for 2035;Guariguata;Diabetes Res Clin Pract,2014