In the verum acupuncture group, participants will receive real needle insertion. Sterile needles (0.18 mm in diameter and 30 mm in length, DONGBANG Needle, Korea) will be used on all acupoints. The depth of insertion will vary from 15 mm to 20 mm depending on the exact locations. An initial manual stimulation will be given at insertion by rotation methods to produce a specific sensation described as "de-qi" in TCM (a sensation perceived by the acupuncture receivers as numbness, fullness, and sometimes soreness around the point. Then the needles will be left in the acupoint for 20 min, with a manual rotation at 4-8 Hz and an amplitude of approximately 0.5-2 rotations at a ten-min interval to maintain the sensation of "de-qi".