The efficacy and safety of electrical acupoint stimulation (EAS) for knee osteoarthritis (KOA): A GRADE-assessed systematic review, meta-analysis and trial sequential analysis - Guangyi Yang; Rong Zhang; Botan Xu; Yi Yang; Yuxuan Wang; Wenjing Xu; Pengwei Li; Aotian Yu; Simin Ning; Qixuan Fu; Jianfeng Tu (PLoS ONE, 2025)