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Opolski G, Torbicki A, Kosior DA, Szulc M, Wozakowska-Kaplon B, Kolodziej P, Achremczyk P; Investigators of the Polish How to Treat Chronic Atrial Fibrillation Study.Opolski G, et al.Chest. 2004 Aug;126(2):476-86. doi: 10.1378/chest.126.2.476.Chest. 2004.PMID: 15302734Clinical Trial.