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Results of the single and multiple-SNP Mendelian randomization (MR) analyses for effect of leptin levels in females (Kilpeläinen et al., 2016) on risk for anorexia nervosa (AN) (Watson et al., 2019). The SNP rs8043757 (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.
