1. Cardiovascular Center, Seoul St. Mary's Hospital, Seoul, Korea.
2. Cardiovascular Center, Chonnam National University Hospital, Gwangju, Korea.
3. Cardiovascular Center, Kyungpook National University, Daegu, Korea.
4. Cardiovascular Center, Keimyung University Dongsan Medical Center, Daegu, Korea.
5. Cardiovascular Center, Pusan National University Hospital, Busan, Korea.
6. Cardiovascular Center, Yeungnam University Hostpial, Daegu, Korea.
7. Cardiovascular Center, Chungnam National University Hostpial, Daejon, Korea.
8. Cardiovascular Center, Chonbuk National University Hospital, Jeonju, Korea.
9. Cardiovascular Center, Jeonju Presbyterian Medical Center, Jeonju, Korea.
10. Cardiovascular Center, Seoul National University Bundang Hospital, Seongnam, Korea.
11. Cardiovascular Center, Chungbuk National University, Cheongju, Korea.
12. Cardiovascular Center, Konyang University, Daejon, Korea.
13. Cardiovascular Center, Korea University Guro Hospital, Seoul, Korea.
14. Cardiovascular Center, Kyunghee University Hospital, Seoul, Korea.
15. Cardiovascular Center, Yonsei University Hospital, Seoul, Korea.
16. Cardiovascular Center, Wonju University Hospital, Wonju, Korea.
17. Cardiovascular Center, Ulsan University Asan Medical Center, Seoul, Korea.