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Nijs, Jo; Lluch Girbés, Enrique; Lundberg, Mari; Malfliet, Anneleen; Sterling, Michele . (2015). Exercise therapy for chronic musculoskeletal pain: Innovation by altering pain memories. Manual Therapy, 20(1), 216–220. doi:10.1016/j.math.2014.07.004 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research