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Locations of classical acupoint and non-classical acupoint: (a) GV24, GV20, EX-HN1, bilateral ST36, PC8, HT7, KI3 were selected as classical acupoints in the EA group; (b) On the other hand, four bilateral points located in upper limbs and three bilateral points located in lower limbs were selected for the sham electro-acupuncture group. Sham EA stimulation was applied with light and sound stimulation at a frequency of 3Hz without electric stimulation.
