3An-Shine Chao,Angel Chao,Tzu-Hao Wang,Yu-Cheng Chang,Hsiu-Huei Peng,Shuenn-Dyh Chang,Anne Chao,Chee-Jen Chang,Chyong-Huey Lai,Alice M.K. Wong.Pain relief by applying transcutaneous electrical nerve stimulation (TENS) on acupuncture points during the first stage of labor: A randomized double-blind placebo-controlled trial[J].Pain.2007(3)