Comparison between the long-axis/in-plane and short-axis/out-of-plane approaches for ultrasound-guided vascular catheterization: an updated meta-analysis and trial sequential analysis. - Liu, Chao; Mao, Zhi; Kang, Hongjun; Hu, Xin; Jiang, Shengmao; Hu, Pan; Hu, Jie; Zhou, Feihu (Therapeutics & Clinical Risk Management, 2018)