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Two world maps regarding gross domestic product per capita (PPP) 2009 adjusted by international $ (a) and the prevalence of advanced HIV disease (b)
PPP 2009 was adopted because the median year of study period for all the included studies is 2009. Due to data unavailable of PPP 2009 in China (Taiwan) from the World Bank, the area of China (Taiwan) filled with dark grey in the map (a).
