1. From the Department of Medicine (J.W.P., S.M.P., S.M.K., E.H.K.), Divisions of Cardiology (S.J.P., J.S.K.) and Endocrinology (K.Y.H.), and Departments of Surgery (J.H.K.) and Pathology (Y.L.C.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.