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Via, G.; Tavazzi, G.; Price, S. . (2016). Ten situations where inferior vena cava ultrasound may fail to accurately predict fluid responsiveness: a physiologically based point of view. Intensive Care Medicine, 42(7), 1164–1167. doi:10.1007/s00134-016-4357-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research