At the same time of basic treatment , the electroacupuncture was applied at Changqiang ( GV @ ) and Chengshan ( BL @ ) @ min before surgery in the electroacupuncture group , while shallow needling without electrical stimulation at sham acupoint ( @ cm next to acupoint ) was applied @ min before surgery in the sham electroacupuncture group , while no treatment was given before the surgery in the blank group .