1. United Nations Statistic Division. Composition of macro geographical (continental) regions, geographical sub-regions, and selected economic and other groupings. Available: http://unstats.un.org/unsd/methods/m49/m49regin.htm#asia. Accessed 13 March 2015.
2. United Nations Department of Economic and Social Affairs. World Population Prospects: The 2012 Revision. Available: http://esa.un.org/wpp/Excel-Data/population.htm. Accessed 13 March 2015.
3. Hashim J, Chongsuvivatwong V, Phua KH, Pocock N, Teng YM, Chhem RK, et al. Health and healthcare systems in Southeast Asia. 04 May 2012. Available: http://unu.edu/publications/articles/health-and-healthcare-systems-in-southeast-asia.html. Accessed 28 June 2015.
4. World Health Organization. Health workers: a global profile. In The world health report 2006- working together for health; 2006. Available: www.who.int/whr/2006/06_chap1_en.pdf. Accessed 19 June 2015.
5. Health and health-care systems in Southeast Asia: diversity and transitions;V Chongsuvivatwong;Lancet,2011