Fig. 4

Begg’s funnel plot for publication bias analysis. A is the model of TT vs. TG + GG; B is the model of TT +TG vs. GG; C is the model of T vs. G
Begg’s funnel plot for publication bias analysis. A is the model of TT vs. TG + GG; B is the model of TT +TG vs. GG; C is the model of T vs. G