**Figure 6. **Begg’s funnel plots of publication bias analyses. The horizontal line in the figure means the overall estimated log-transformed
odds ratio (OR) and the two diagonal lines represent the pseudo 95% confidence limits of the effect estimate(95% CI). **A**: Funnel plot for the genetic model of ε2/ε3 vs. ε3/ε3. **B**: Funnel plot for the genetic model of ε2/ε4 vs. ε3/ε3. **C**: Funnel plot for the genetic model of ε4/ε4 vs. ε3/ε3. **D**: Funnel plot for the genetic model of ε2 allele vs. ε3 allele. **E**: Funnel plot for the genetic model of ε4 allele vs. ε3 allele. **F**: Funnel plot for the genetic model of ε2/ε2 vs. ε3/ε3*.*