In the observation group , based on the treating principle of warming yang and benefiting qi , acupuncture was applied to Xinshu ( BL 15 ) , Pishu ( BL 20 ) , Shenshu ( BL 23 ) , Yaoyangguan ( GV 3 ) , Baihui ( GV 20 ) , Neiguan ( PC 6 ) and Shenmen ( HT 7 ) .