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Results of single and multiple-SNP Mendelian randomization (MR) analyses for effect of leptin levels (Yaghootkar et al., 2020) on risk for anorexia nervosa (AN) (Watson et al., 2019). The SNP rs1121980 (FTO) was excluded (A) The black lines in forest plot visualize the results of single SNP analyses; the red lines visualize the results of the multiple SNP analysis (B) In scatter plot the slopes of each line represent the causal association for different MR method.
