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WÓJCIK, MACIEJ; BERKOWITSCH, ALEXANDER; ZALTSBERG, SERGEY; HAMM, CHRISTIAN W.; PITSCHNER, HEINZ F.; KUNISS, MALTE; NEUMANN, THOMAS . (2014). Score Associated with the Outcome after Multiple Ablation Procedures in Patients with Atrial Fibrillation. Pacing and Clinical Electrophysiology, 37(6), 682–690. doi:10.1111/pace.12356 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research