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Maggie Westby, Ian Bullock, Paul N Cooper and Sarah Davis. (2010). GUIDELINES: Transient loss of consciousness—initial assessment, diagnosis, and specialist referral: summary of NICE guidance. BMJ: British Medical Journal, 341(7772), 552–554. doi:10.2307/20766356 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research