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Modified CONSORT flow diagram for the trial. Abbreviations: VAS = visual analogue scale; EA = electroacupuncture; CBZ = carbamazepine; SEA = sham electroacupuncture; P = placebo; SF-MPQ = Short-Form McGill pain questionnaire; PRI: pain rating index; PPI: present pain intensity; BPI-Facial: brief pain inventory-facial scale; PGIC: patient global impression of change
