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Stokke, Thomas M.; Ruddox, Vidar; Sarvari, Sebastian I.; Otterstad, Jan E.; Aune, Erlend; Edvardsen, Thor . (2014). Brief Group Training of Medical Students in Focused Cardiac Ultrasound May Improve Diagnostic Accuracy of Physical Examination. Journal of the American Society of Echocardiography, 27(11), 1238–1246. doi:10.1016/j.echo.2014.08.001 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research