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2. http://www.who.int/tb/publications/global_report/2011/gtbr11_full.pdf
3. Sandgren A Hollo V van der Werf MJ Extrapulmonary tuberculosis in the European Union and European Economic Area, 2002 to 2011 http://www.eurosurveillance.org/ViewArticle. aspx?ArticleId=20431
4. Site of extrapulmonary tuberculosis is associated with HIV infection;Leeds;Clin Inf Dis,2012