In the yin-yang needling group , the acupoints of yin meridians such as Zuwuli ( LR @ ) , Xuehai ( SP @ ) , Yinlingquan ( SP @ ) and Sanyinjiao ( SP @ ) , etc. and the acupoints of yang meridians such as Biguan ( ST @ ) , Liangqiu ( ST @ ) and Yanglingquan ( GB @ ) , etc. were selected .