FGF21 and migraine disorder: The plasma level of FGF-21 was not different comparing the migraine group (27.5 pg/mL, 16.3–85.5 pg/mL, n = 230) with the control group (38.0 pg/mL, 14.9–94.0 pg/mL, n = 98, p = 0.635, Mann–Whitney U test).