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Flow chart of study selection for Prostate Stem cell antigen (PSCA) rs2294008 polymorphism. The study by Lochhead et al. (2011) [42] involved three case-control studies out of which one study was excluded because of deviation from Hardy-Weinberg equilibrium (HWE) in control population, so the number of case-control studies are different than number of articles included in the meta-analysis.
