PJ-015 Preventive Effect of Renin-Angiotensin System Inhibitor on Left Atrial Remodeling in Patients with Chronic Atrial Fibrillation : Longterm Echocardiographic Study(PJ003,Atrial/Supraventricular Arrhythmia (Clinical/Diagnosis) (A),Poster Session (Japanese),The 73rd Annual Scientific Meeting of The Japanese Circulation Society)