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Haas, Marion; De Abreu Lourenco, Richard . (2015). Pharmacological Management of Chronic Lower Back Pain: A Review of Cost Effectiveness. PharmacoEconomics, 33(6), 561–569. doi:10.1007/s40273-015-0258-y 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research