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Flowchart and principal assumptions of the current MR study. AA, alopecia areata; MR, Mendelian randomization; AC, absolute cell counts; RC, relative cell counts; MFI: median fluorescence intensity; MP, morphological parameters; GWAS, genome‐wide association study; IVs, instrumental variables; LD, linkage disequilibrium; IVW, inverse‐variance weighted; WM, weighted median; MR‐PRESSO, MR‐Egger regression and MR‐pleiotropy residual sum and outlier.
