References
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- UNICEF and World Health Organization (2012) Progress on Drinking Water and Sanitation: 2012 Update. Available at http://www.who.int/water_sanitation_health/publications/2012/jmp_report/ (accessed 2 April 2012)
- World Health Organization (WHO) (2012) WHO Statistical Information System (WHOSIS). Available at: http://www.who.int/whosis/indicators/compendium/2008/2wst/en/ (accessed 12 April 2012)