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Eisenhut, Michael. (2009). Procalcitonin Measurement to Reduce Antibiotic Use in Influenza. Biosecurity and Bioterrorism: Biodefense Strategy, Practice, and Science, 7(4), 453–454. doi:10.1089/bsp.2009.0055 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research