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Page, S. J.; Fulk, G. D.; Boyne, P. . (2012). Clinically Important Differences for the Upper-Extremity Fugl-Meyer Scale in People With Minimal to Moderate Impairment Due to Chronic Stroke. Physical Therapy, 92(6), 791–798. doi:10.2522/ptj.20110009 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research