deletions | additions       diff --git a/section_Incidence_Incidence_is_defined__.tex b/section_Incidence_Incidence_is_defined__.tex  index 353cbf2..051f62b 100644  --- a/section_Incidence_Incidence_is_defined__.tex  +++ b/section_Incidence_Incidence_is_defined__.tex 
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$0 < \lvert \frac{dI}{dt} \rvert < \lvert \frac{dM}{dt} \rvert $  A full description of the methods used in regional workshops where expert opinion was systematically elicited following an in-depth analysis of surveillance data is publicly available in a report of the workshop held for countries in the African Region (in Harare, Zimbabwe, December 2010: http://www.who.int/tb/advisory_bodies/impact_measurement_taskforce). 2010\cite{WHO}).  In some countries case reporting coverage changed significantly during the period 1990-2013 as a result of surveillance reforms (e.g. disease surveillance was thoroughly reformed after the SARS epidemic in China, the MoJ sector notified cases in Russia starting in the early 2000s). Trends in incidence were derived from repeat tuberculin survey results in Bhutan, India and Yemen and for 40 countries (including countries in Eastern Europe) from trends in mortality. Distributions of the proportion of cases that were not reported in the three reference years were assumed to follow a Beta distribution, with the expected value $E$ and variance $V$ obtained using the method of moments\cite{Renyi2007}. Time series for the period 1990–2014 were built according to the characteristics of the levels of underreporting and under-diagnosis that were estimated for the three reference years. A cubic spline extrapolation of V and E, with knots set at the reference years, was used for countries with low-level or concentrated HIV epidemics. In countries with a generalized HIV epidemic, the trajectory of incidence from 1990 to the first reference year (usually 1997) was based on the annual rate of change in HIV prevalence.  
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