Effect of dual-acupoint and single-acupoint electric stimulation on postoperative outcomes in elderly patients subjected to gastrointestinal surgery: study protocol for a randomize... by Zhi-hong Lu, Hai-long Dong, Jia-wen Huang-fu, Xiao-jian Fan, Wei-xian Zhao, Su Min, Wei Zhang, Ming-fu Liu, Yong-hui Wang, Li-ni Wang, Li-ze Xiong

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