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Absolute standardized differences of 45 baseline characteristics between patients receiving and not receiving warfarin, before and after propensity score matching (*Symptoms experienced during atrial fibrillation in the last six months; **Hospitalization for qualifying episodes of atrial fibrillation; ACE = angiotensin-converting enzyme; HTN = hypertension; NYHA = New York Heart Association; PND = paroxysmal nocturnal dyspnea)
