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Gloria Cordoba, Lisa Schwartz, Steven Woloshin, Harold Bae and Peter C Gøtzsche. (2010). Definition, reporting, and interpretation of composite outcomes in clinical trials: systematic review. BMJ: British Medical Journal, 341(7769), 381–. doi:10.2307/20766152 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research