1. From the Departments of Cardiology (X.W.C., K.O., T.M.) and Geriatrics (Z.H., M.K.), Nagoya University Graduate School of Medicine, Nagoya, Japan; Department of Cardiology (X.W.C.), Yanbian University Hospital, Yanji, Jilin Province, China; Department of Internal Medicine (X.W.C.), Kyung Hee University Hospital, Seoul, Korea.