1. Yonsei University, Seoul, Republic of Korea
2. University College London, London, UK
3. Korea University, Seoul, Republic of Korea
4. Seoul National University, Seoul, Republic of Korea
5. Sungkyunkwan University, Seoul, Republic of Korea
6. University of Ulsan, Seoul, Republic of Korea
7. The Catholic University of Korea, Seoul, Republic of Korea
8. Seoul National University, Sungnam, Republic of Korea
9. CHA University, Sungnam, Republic of Korea
10. Korea Medical Institute, Seoul, Republic of Korea
11. Daejeon Sun General Hospital, Daejeon, Republic of Korea
12. Konyang University Hospital, Daejeon, Republic of Korea
13. Chungnam National University, Daejeon, Republic of Korea
14. Soonchunhyang University, Cheonan, Republic of Korea
15. Daejeon Eulji University Hospital, Daejeon, Republic of Korea
16. Daegu Catholic Hospital, Daegu, Republic of Korea
17. Yonsei University, Wonju, Republic of Korea
18. Ajou University, Suwon, Republic of Korea
19. University of Ulsan, College of Medicine, Ulsan, Korea
20. Asan Medical Center, Seoul, Republic of Korea
21. Dong-A University Medical Center, Busan, Republic of Korea
22. National Health Insurance Service, Seoul, Republic of Korea
23. University of Southern California, CA, USA
24. Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA