1. Division of Cardiology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Radiology, NewYork-Presbyterian Hospital and the Weill Cornell Medical College, New York, NY, USA.
3. Department of Internal Medicine/Geriatrics, Yale School of Medicine, Adler Geriatric Center, New Haven, CT, USA.
4. Division of Cardiology, Kangnam Sacred Heart Hospital, Hallym University Medical Center, Seoul, Korea.
5. Division of Cardiology, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
6. Division of Cardiology, Myongji Hospital, Kwandong University College of Medicine, Goyang, Korea.