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