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2. https://www.cia.gov/library/publications/the-world-factbook/geos/br.html
3. http://hdr.undp.org/en/media/HDR_2010_EN_Complete.pdf
4. Annual data report: Atlas of end-stage renal disease in the United States;Excerpts From the;Am J Kidney Dis,2006
5. The global burden of chronic kidney disease and the way forward;Alebiosu;Ethn Dis,2005