Mechanistic study of electroacupuncture in the treatment of insomnia: study protocol for a clinical trial of serum metabolomics based on UPLC-Q/TOF-MS and UPLC-QQQ-MS/MS - Zhang, Yuting; Cao, Ziqiong; Ye, Junlan; Dai, Guoliang; Qin, Shan; Wang, Xiaoqiu; Wu, Wenzhong; Liu, Chengyong (Frontiers in Psychiatry, 2025)