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The Influence of Left Ventricular Ejection Fraction on the Effectiveness of Cardiac Resynchronization TherapyKutyifa, Valentina; Kloppe, Axel; Zareba, Wojciech; Solomon, Scott D.; McNitt, Scott; Polonsky, Slava; Barsheshet, Alon; Merkely, Bela; Lemke, Bernd; Nagy, Vivien Klaudia; Moss, Arthur J.; Goldenberg, Ilan · Journal of the American College of Cardiology · 2013