1. Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
2. Biostatistics Center, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
3. Department of Cardiovascular Medicine, Tokyo Medical and Dental University, Tokyo, Japan
4. Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
5. Division of Cardiology, Kyung Hee University Hospital, Seoul, Republic of Korea