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Girotra, Saket; Nallamothu, Brahmajee K.; Spertus, John A.; Li, Yan; Krumholz, Harlan M.; Chan, Paul S. . (2012). Trends in Survival after In-Hospital Cardiac Arrest. New England Journal of Medicine, 367(20), 1912–1920. doi:10.1056/nejmoa1109148 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research