Usefulness of Bedside Tissue Doppler Echocardiography and B-Type Natriuretic Peptide (BNP) in Differentiating Congestive Heart Failure from Noncardiac Cause of Acute Dyspnea in Elderly Patients with a Normal Left Ventricular Ejection Fraction and Permanent, Nonvalvular Atrial Fibrillation: Insights from a Prospective, Monocenter Study

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