1. Department of Internal Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Family Medicine, Inje University Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea.
4. Department of Family Medicine, Konyang University Hospital, Konyang University College of Medicine, Daejeon, Korea.
5. Department of Family Medicine, Ajou University School of Medicine, Suwon, Korea.
6. Department of Family Medicine, Korea University College of Medicine, Seoul, Korea.
7. Department of Dietetics, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
8. Department of Physical Education, Yonsei University, Seoul, Korea.
9. Department of Pediatrics, National Medical Center, Seoul, Korea.
10. Department of Family Medicine, Gachon University Dongincheon Gil Hospital, Gachon University of Medicine and Science, Incheon, Korea.
11. Department of Internal Medicine, Gachon University Gil Hospital, Gachon University of Medicine and Science, Incheon, Korea.
12. Department of Family Medicine, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, Korea.
13. Department of Family Medicine, Sanggye Paik Hospital, Inje University, Seoul, Korea.
14. Department of Internal Medicine, Eulji University Hospital, Eulji University School of Medicine, Daejeon, Korea.
15. Department of Internal Medicine, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea.
16. Department of Pediatrics, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.
17. Department of Internal Medicine, Kyung Hee University School of Medicine, Seoul, Korea.
18. Department of Surgery, Soonchunhyang University College of Medicine, Seoul, Korea.
19. Department of Family Medicine, Chungnam National University School of Medicine, Daejeon, Korea.