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The data sources are as follows: Data on HIV prevalence (population 15-49 years) and ARV coverage are from the World Development Indictors (WDI) and refer to 2011: URL: http://databank.worldbank.org/ddp/home.do?Step=2&id=4&DisplayAggregation=N&SdmxSupported=Y&CNO=2&SET_BRANDING=YES Data on Aids-related deaths and AIDS orphans are from UNAIDS (and their AIDSinfo database) and refer to 2011: URL: http://www.unaids.org/en/regionscountries/countries/unitedrepublicoftanzania (UNAIDS TZ homepage) / http://www.aidsinfoonline.org/ (AIDSinfo database) The CIA World Factbook also shows the number of AIDS-related deaths by country, with data referring to 2009: URL: https://www.cia.gov/library/publications/the-world-factbook/rankorder/2157rank.html The CIA World Factbook is used in the blog to determine that Tanzania ranks 4th worldwide in terms of the total number of AIDS-related deaths. This is because the AIDSinfo database lacks information on India, which (according to the CIA World Factbook) was the country with the third largest number of AIDS-related deaths in 2009. In any case, the 2011 UNAIDS estimate of the total number of AIDS-related deaths in Tanzania (84,000) is very close to the 2009 estimate tabulated in the CIA World Factbook (86,000).