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