1. Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
2. Division of Pediatric Gastroenterology and Hepatology, Department of Pediatrics, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea.
3. Department of Pediatrics, Jangs Hospital, Seoul, Korea.
4. Department of Pediatrics, Inje University Busan Paik Hospital, Busan, Korea.
5. Department of Pediatrics, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Korea.
6. Department of Pediatrics, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
7. Department of Pediatrics, Bucheon St. Mary’s Hospital, The Catholic University College of Medicine, Bucheon, Korea.
8. Department of Pediatrics, National Medical Center, Seoul, Korea.
9. Department of Pediatrics, Asan Medical Center, Ulsan University College of Medicine, Seoul, Korea.
10. Department of Pediatrics, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
11. Department of Pediatrics, Seoul National University-Seoul Metropolitan Government Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea.
12. Department of Pediatrics, Yonsei University College of Medicine, Seoul, Korea.
13. Chung-Ang University Industry Academic Cooperation Foundation, Seoul, Korea.