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Luan, Lijiang; Bousie, Jaquelin; Pranata, Adrian; Adams, Roger; Han, Jia . (2020). Stationary cycling exercise for knee osteoarthritis: A systematic review and meta-analysis. Clinical Rehabilitation, (), 026921552097179–. doi:10.1177/0269215520971795 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research