For patients of the EA group who were undergoing controlled ovarian hyperstimulation , EA stimulation ( @ Hz/@ Hz , @-@ V ) was applied to bilateral Shenshu ( BL @ ) , Qihai ( CV@ ) , bilateral Zusanli ( ST @ ) - Sanyinjiao ( SP @ ) , and bilateral Neiguan ( PC@ ) - Zigong ( EX-CA @ ) for @ min , once daily till accepting embryo transplant .