With EA at Jianqian ( Extra ) , Taijian ( Extra ) , Binao ( LI 14 ) , Jianzhong ( Extra ) , Jianzhen ( SI 9 ) , Naoshu ( SI 10 ) , Jianwaishu ( SI 14 ) and Bingfeng ( SI 12 ) , IW group was treated with intermittent wave with a frequency of 15 Hz , DW group was treated with disperse-dense wave with a frequency of 2 Hz/15 Hz and CW group was treated with continuous wave with a frequency of 15 Hz .