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Rachel Senden; Bernd Grimm; Kenneth Meijer; Hans Savelberg; Ide C. Heyligers. (2011). The importance to including objective functional outcomes in the clinical follow up of total knee arthroplasty patients. , 18(5), 306–311. doi:10.1016/j.knee.2010.07.008 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research