Fig. 4From: Gene polymorphisms and expression levels of interleukin-6 and interleukin-10 in lumbar disc disease: a meta-analysis and immunohistochemical studyFunnel plot analysis for publication bias in selection of studies on IL-6 gene polymorphism (rs1800796) under allelic contract model (C vs. G). There was no significant publication bias (P > 0.05)Back to article page