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Forest plots for the association between brain-derived neurotrophic factor rs6265 and migraine under the allelic (A), dominant (B), or recessive (C) genetic model of inheritance. The summary odds ratio (OR) is represented by the diamond, where the center of the diamond indicates the OR and the ends of the diamond correspond to the 95% confidence interval. ES, effect size (OR); W, weight; Sig, statistical significance; N1, cases; N2, controls.
