Effectiveness and safety of different electromagnetic stimulation therapies in treating post-stroke insomnia: A network meta-analysis of randomized controlled trials - Shuan-Zhu Sun; Fan Yuan; Lie-Xi Song; Xiao-Zhong Liu; Tao Zhong; De-Liang Zhu; Ke-Yu Chen; Wei-Cheng Wang; Ruo-Yang Li (PLoS ONE)