1. history of major systemic illness, including uncontrolled hypertension, diabetes, chronic renal insufficiency, autoimmune diseases or malignancies

2. history of neurological disorders which might affect sensation such as previous stroke or peripheral neuropathy

3. pregnancy or lactation

4. epilepsy

5. moderate depressed (BDI\>20)

6. using prophylactics for migraine

7. other remote electrical stimulation contraindications, such as open wound, sensory impairment, metal implant

8. other transcranial magnetic stimulation contraindications, such as, high intracranial pressure, cochlear implant, cranial metal implant

9. other magnetic resonance imaging contraindications, such as, pacemaker, stent, metal implant, claustrophobia

Peripheral Electrical Stimulation for Migraine Prevention