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Manhattan plot showing strength of association (negative logarithm of p-value of association statistic) of the tested SNPs with sPTB. Horizontal lines indicate strength of associations i.e. p = 1.02e-4 and p = 2.51e-3 corresponding to the 1% (red) and 5% (blue) upper tail association statistic thresholds obtained from the empirical bootstrap frequency distribution, respectively.
