1. Inha University Hospital, Incheon, South Korea.
2. Samsung Medical Center, Sung Kyun Kwan University School of Medicine, Seoul, South Korea.
3. The Catholic University of Korea College of Medicine, Seoul, South Korea.
4. Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, South Korea.
5. Chungbuk National University Hospital, Cheongju, South Korea.
6. Seoul Paik Hospital, Inje University, Seoul, South Korea.
7. Jeonbuk National University Medical School, Jeonju, South Korea.
8. Ewha Womans University Mokdong Hospital, Seoul, South Korea.
9. Asan Medical Center, University of Ulsan College of Medicine, Ulsan, South Korea.
10. College of Medicine, Hanyang University, Seoul, South Korea.
11. Kyungpook National University, Daegu, South Korea.
12. Seoul National University Hospital, Seoul, South Korea.