Table 1. Details of the electroacupuncture intervention.

Item	Parameter
Needling instrument	length: 25–50 mm, diameter: 0.25 mm; Hwato, Suzhou, China
Retaining time	30min
Treatment sessions	24
Frequency	Three times a week
Manipulation	After the needle inserted, lift, thrust and thrill smoothly for at least 10s to achieve De qi.
Electrical acupoints	Wire 1: LR8 and GB33. Wire 2: 2 of 3 adjunct acupoints.
Electric parameter	Disperse-dense wave. The current will be increased slowly from zero to the degree which the participant can feel but tolerate.