CALCA and migraine disorder: Compared to placebo group, CGRP mAb therapy resulted in a reduction of monthly migraine days [weighted mean difference (WMD) = − 1.44, 95% CI = (− 1.68,− 1.19)] and acute migraine-specific medication days [WMD = − 1.28, 95% CI = (− 1.66,− 0.90)], with an improvement in 50% responder rate [RR = 1.51, 95% CI = (1.37,1.66)].