1. Chonnam National University Hospital, Gwangju, Korea.
2. Gangneung Asan Hospital, Gangneung, Korea.
3. Dong-A University Hospital, Busan, Korea.
4. Ajou University Hospital, Suwon, Korea.
5. Wonju Christian Hospital, Wonju, Korea.
6. Korea University Guro Hospital, Seoul, Korea.
7. Inha University Hospital, Incheon, Korea.
8. Hallym University Kangdong Sacred Heart Hospital, Seoul, Korea.
9. Kangwon National University Hospital, Chuncheon, Korea.
10. Pusan National University Hospital, Busan, Korea.
11. Inje University Sanggye Paik Hospital, Seoul, Korea.
12. Soonchunhyang University Seoul Hospital, Seoul, Korea.
13. Soonchunhyang University Cheonan Hospital, Cheonan, Korea.
14. Inje University Ilsan Paik Hospital, Goyang, Korea.
15. Chungbuk National University Hospital, Cheongju, Korea.
16. The Catholic University of Korea Bucheon St. Mary's Hospital, Bucheon, Korea.