deletions | additions       diff --git a/sec_Biomarkers_of_AD.tex b/sec_Biomarkers_of_AD.tex  index ffecb91..65ef1c9 100644  --- a/sec_Biomarkers_of_AD.tex  +++ b/sec_Biomarkers_of_AD.tex 
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Several biomarkers for AD are currently being studied across the world.  These biomarkers have different relevance at different stages of AD progression.  Jack et al \cite{Jack2010,Jack_2013} describe the temporal evolution of AD biomarkers and their interrelationships amongst themselves, and with the onset and progression of clinical symptoms.  The staging of the disease follow a progression from normal to mild cognitive impairment (MCI) to eventually dementia.  Figure \ref{fig:hypotheticalModelJack_2013} shows the staging of the disease and the biomarkers of AD as proposed by by Jack et al in \cite{Jack2010,Jack_2013}.  Well established biomarkers for AD till date are the following:  \begin{itemize}