1. From the Division of Cardiology, Department of Internal Medicine, Kyung Hee University Hospital, School of Medicine, Kyung Hee University, Seoul, Republic of Korea (J.S.W., W.K., S.J.H., J.B.K., S.-J.K., W.-S.K., K.S.K.); and Department of Radiology, Chonnam National University Hospital, Gwangju, Republic of Korea (H.J.S).