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. 2020 Jan 7;11:29. doi: 10.1038/s41467-019-13870-3

Fig. 2. Directed acyclic graph of instrumental variable assumptions made in multivariable Mendelian randomization.

Fig. 2

G = genetic variants, Xj = risk factor j for j=1,,d, Y = outcome, U = confounders, θj = causal effect of risk factor j.