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. 2012 Oct 15;7(10):e47705. doi: 10.1371/journal.pone.0047705

Figure 1. Path diagram of the multiple-mediation model for the study of SNP rs1051730, smoking behavior, COPD, and lung cancer.

Figure 1

X: initial predictor variable (SNP). M1: mediator (smoking behavior). M2: mediator (COPD). Y: outcome variable of interest (lung cancer).