Review Article
Impact of CYP1A1 Polymorphisms on Susceptibility to Chronic Obstructive Pulmonary Disease: A Meta-Analysis
Figure 5
Begg’s funnel plot on publication bias for included studies on the association of the CAP1A1 MspI and Ile/Val polymorphisms with susceptibility to COPD. The symmetrical shape of the funnel plot indicated absence of publication bias.