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Marius Rehn; Pablo Perel; Karen Blackhall; Hans Morten Lossius. (2011). Prognostic models for the early care of trauma patients: a systematic review. , 19(1), 17–0. doi:10.1186/1757-7241-19-17 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research