1. Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea.
2. Hallym University Sacred Heart Hospital, Korea.
3. Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Korea.
4. Soonchunhyang University Bucheon Hospital, Korea.
5. Hanyang University Hospital, Korea.
6. University of Ulsan College of Medicine, Asan Medical Cetner, Korea.
7. Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Korea.
8. Gangnam Severance Hospital, Yonsei University College of Medicine, Korea.
9. Kyung Hee University Medical Center, Kyung Hee University School of Medicine, Korea.
10. Health Insurance Review & Assessment Service, Korea.
11. Korea Centers for Disease Control and Prevention, Korea.
12. Kwandong University Myongji Hospital, Korea.