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\begin{tabular}{ l || l | l | l | c }  Study & Sample Size & SNPs Genotyped & Genes Discovered & Reference \\  \hline  Harold et al (2009) & 1000 & 1 million & 14 2:\textit{CLU},\textit{PICALM} &  \\ Lambert et al (2009)& 1000 & 1 million & 14 2:\textit{CLU},\textit{CR1} &  \\ Seshadri et al (2010) & 1000 & 1 million & 14 1:\textit{BIN1} &  \\ Naj et al (2011) & 1000 & 1 million & 14 \textit{ABCA7},\textit{MS4A6A/4E},\textit{EPHA1},\textit{CD2AP},\textit{CD33} & \\  Hollingworth et al (2011) & 1000 & 1 million & \textit{ABCA7},\textit{MS4A6A/4E},\textit{EPHA1},\textit{CD2AP},\textit{CD33} &  \\ Lambert et al (2013) & 1000 & 1 million & \textit{PTK2$\beta$},\textit{SORL1}, \textit{FERMT2}, \textit{\CASS4}, \textit{CELF1}, \textit{HLA-DR1}, \textit{NME8} &  14 \\ \hline\hline  \end{tabular}   \caption{Genome-wide association studies (GWAS) of late-onset Alzheimer's disease (LOAD) conducted to date. }