deletions | additions       diff --git a/section_Historical_background_Incidence_surveys__.tex b/section_Historical_background_Incidence_surveys__.tex  index 7fb7508..f9feae7 100644  --- a/section_Historical_background_Incidence_surveys__.tex  +++ b/section_Historical_background_Incidence_surveys__.tex 
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First WHO systematic estimation exercise\cite{1600578}.  Global reassessment\cite{10517722}.  Using tuberculin survey results\cite{Styblo1985}