1. Department of Pediatrics, Chung-Ang University Hospital, Chung-Ang University, College of Medicine, Seoul, Korea.
2. Department of Pediatrics, Chonbuk National University Hospital, Chonbuk National University Medical School, Jeonju, Korea.
3. Department of Pediatrics, Chungbuk National University College of Medicine, Chungju, Korea.
4. Department of Pediatrics, Nowon Eulji Medical Center, Eulji University School of Medicine, Seoul, Korea.
5. Department of Pediatrics, Gyeongsang National University Changwon Hospital, Changwon, Korea.
6. Department of Pediatrics, Hanyang University College of Medicine, Seoul, Korea.
7. Department of Pediatrics, Jeju National University Hospital, Jeju, Korea.
8. Department of Pediatrics, Kangwon National University School of Medicine, Chuncheon, Korea.
9. Department of Pediatrics, Korea University Guro Hospital, Seoul, Korea.
10. Department of Pediatrics, Korea University College of Medicine, Seoul, Korea.
11. Department of Pediatrics, School of Medicine, Kyungpook National University, Daegu, Korea.
12. Department of Pediatrics, Pusan National University Children's Hospital, Pusan National University School of Medicine, Yangsan, Korea.
13. Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
14. Department of Pediatrics, Seoul National University Children's Hospital, Seoul National University College of Medicine, Seoul, Korea.
15. Department of Pediatrics, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea.
16. Department of Physical Education, College of Education, Chung-Ang University, Seoul, Korea.
17. Department of Psychiatry, Jeju National University Hospital, Jeju, Korea.
18. Department of Medical Nutrition, Kyung Hee University, Seoul, Korea.
19. Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Korea.
20. Department of Pediatrics, Seoul National University College of Medicine, Seoul, Korea.