Fig. 1
From: Retinol and retinol binding protein 4 levels and COVID-19: a Mendelian randomization study
The diagram of the study design. GWAS, genome-wide association studies; MR-PRESSO, Mendelian Randomization Pleiotropy Residual Sum and Outlier; MR, mendelian randomization. R2, A measure of the linkage disequilibrium between two genetic loci to quantify their correlation (value of 1 denotes perfect correlation). SNP, single nucleotide polymorphism; Window size, the length of the region of linkage disequilibrium