Fig. 1

Distribution of MTHFR polymorphism among the groups; Headache Free (HF), Migraine with Aura (MA), Tension-type headache (TTH), Migraine without aura (MOA)
Distribution of MTHFR polymorphism among the groups; Headache Free (HF), Migraine with Aura (MA), Tension-type headache (TTH), Migraine without aura (MOA)