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Chun, Se-Woong; Lim, Chai-Young; Kim, Keewon; Hwang, Jinseub; Chung, Sun G. . (2017). The relationships between low back pain and lumbar lordosis: a systematic review and meta-analysis. The Spine Journal, (), S1529943017301912–. doi:10.1016/j.spinee.2017.04.034 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research