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Scatter plot of the causal relationships between OA and PD using different MR methods. (A) Causal estimates for PD on OA. (B) Causal estimates for AgP on OA. (C) Causal estimates for CP on OA. (D) Causal estimates for OA on PD. The slope of each line corresponding to the causal estimates for each method. Individual SNP-effect on the outcome (point and vertical line) against its effect on the exposure (point and horizontal line) was delineated in the background.
