1. Chungbuk National University Hospital, Cheongju, Korea, Republic of
2. Chungnam National University Hospital, Daejeon, South Korea, Korea, Republic of
3. Chungnam National University Hospital, Daejeon, Korea, Republic of
4. The Catholic University of Korea Daejeon St. Mary's Hospital, Daejeon, Korea, Republic of
5. Soonchunhyang University Cheonan Hospital, Cheonan, Korea, Republic of
6. Yuseong Sun Hospital, Daejeon, Korea, Republic of
7. Cha University, Ilsan medical center, Goyang, Korea, Republic of
8. Dankook University Hospital, Cheonan, Korea, Republic of
9. Konyang University hospital, Daejeon, Korea, Republic of