1. Cardiovascular Center; Korea University Guro Hospital; Seoul; Korea
2. Cardiology Department; Tianjin Naikai Hospital; Tianjin; China
3. Cardiovascular Center; Shonan Kamakura General Hospital; Kamakura; Japan
4. Cardiology Department; Tianjin Chest Hospital; Tianjin; China
5. Cardiology Department; The Second Hospital of Tianjin Medical University; Tianjin; China
6. Cardiovascular Center; Chonnam National University Hospital; Gwangju; Korea