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Zang, Kui; Chen, Beibei; Wang, Min; Chen, Doudou; Hui, Liangliang; Guo, Shiguang; Ji, Ting; Shang, Futai . (2019). The effect of early mobilization in critically ill patients: A meta-analysis. Nursing in Critical Care, (), –. doi:10.1111/nicc.12455 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research