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Causal association between immune diseases with migraine without aura. Estimated ORs for the effect of immune diseases on migraine without aura, obtained from an IVW analysis, per outcome database separately and combined over the 2 databases using fixed-effect meta-analyses when the heterogeneity was less than 50%: otherwise, using random-effects meta-analyses. CI, confidence interval; SNPs, single-nucleotide polymorphisms.
