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Patrianakos, Alexandros P.; Parthenakis, Fragiskos I.; Karakitsos, Dimitrios; De Groot, Eric; Skalidis, Emmanuell A.; Nyktari, Eva; Daphnis, Eugene; Vardas, Panos E.. (2007). Relation of Proximal Aorta Stiffness to Left Ventricular Diastolic Function in Patients with End-Stage Renal Disease. , 20(3), 314–323. doi:10.1016/j.echo.2006.08.034 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research