1. Department of Pediatrics, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Pediatrics, School of Medicine, Ewha Womans University, Seoul, Korea.
3. Department of Pediatrics, College of Medicine, Soonchunhyang University, Seoul, Korea.
4. Department of Pediatrics, Yonsei University College of Medicine, Severance Children's Hospital, Seoul, Korea.
5. Department of Pediatrics, Hallym University College of Medicine, Seoul, Korea.
6. Department of Pediatrics, College of Medicine, Kyunghee University, Seoul, Korea.
7. Department of Pediatrics, Hanyang University College of Medicine, Seoul, Korea.
8. Department of Pediatrics, College of Medicine, The Catholic University of Korea, Seoul, Korea.
9. Department of Pediatrics, Korea University College of Medicine, Seoul, Korea.
10. Department of Pediatrics, Inha University College of Medicine, Incheon, Korea.
11. Department of Pediatrics, Dankook University College of Medicine, Cheonan, Korea.
12. Department of Pediatrics, College of Medicine, Pusan National University, Busan, Korea.
13. Department of Pediatrics, Chonnam National University Medical School, Gwangju, Korea.
14. Department of Pediatrics, Chonbuk National University Medical School, Jeonju, Korea.
15. Department of Pediatrics, Yonsei University Wonju College of Medicine, Wonju, Korea.