Figure 4. Flowchart of this study. GWAS, genome-wide association study; GDM, gestational diabetes mellitus; IVW, inverse-variance weighted; MaxLik, maximum likelihood; WM, weighted median; MR.RAPS, mendelian randomization robust adjusted profile score; MR-PRESSO, mendelian randomization pleiotropy residual sum and outlier; BMI, body mass index.