The TA group had treatment at four acupoints: two "obligatory" points on the head and two points on the limbs chosen "according to the syndrome differentiation of meridians in the headache region," said Dr Liang. At each point, acupuncturists elicited the deqi sensation, a feeling of soreness or numbness that indicates effective needling. The acupuncturist used electrostimulation, which, as Dr Liang explained, is similar to manual stimulation in that the same points are stimulated during treatment, but a small electric current is passed between pairs of acupuncture needles. The acupuncture

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