Fig. 4From: A meta-analysis of hypoxia inducible factor 1-alpha (HIF1A) gene polymorphisms: association with cancersFunnel plot of HIF1A polymorphism (a) 1772 C/T for T allele vs. C allele and (b) 1790Â G/A for A allele vs. G allele; showing visual evidence of publication biasBack to article page