Changes

===NOTATIONS===We denote the following to describe our methods:$\mathbf{U_i,k}$ is the score statistic for the $i^{th}$ variant from the $k^{th}$ study $\mathbf{V_ij,k}$ is the covariance of the score statistics between the $i^{th}$ and the $j^{th}$ variant from the $k^{th}$ study $S$ is the number of studies   ===SINGLE VARIANT META ANALYSIS===