Fig. 1From: Mediation by differential DNA methylation of known associations between single nucleotide polymorphisms and bladder cancer riskCausal directed acyclic graph shown as an illustration for a SNP with two mQTL-associated CpG site mediators, where solid arrows correspond to the indirect effect through the mediator. For this study, SNPs rs798766, rs401681, rs2294008, and rs8102137 have one to five mQTL-associated CpG site mediatorsBack to article page