Evaluating the efficacy and safety of electro-acupuncture in patients with antipsychotic-related constipation: protocol for a randomized controlled trial oleh Fang-Ting Yu, Di-He Long, Guang-Xia Shi, Li-Qiong Wang, Jian-Feng Tu, Li-Li Gang, Fu-Quan Liu, Yang Wang, Xiao Cui, Si Bao, Yu Yu, Wei Wei, Shi-Yan Yan, Jing-Wen Yang, Cun-Zhi Liu