1. Department of Pediatrics, Seoul National University Children’s Hospital, Seoul, the Republic of Korea.
2. Department of Pediatrics, Seoul National University College of Medicine, Seoul, the Republic of Korea.
3. Department of Pediatrics, Chung-Ang University Hospital, College of Medicine, Chung-Ang University, Seoul, the Republic of Korea.
4. Department of Pediatrics, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, the Republic of Korea.
5. Department of Pediatrics, Hallym University Sacred Heart Hospital, Anyang, the Republic of Korea.
6. Department of Pediatrics, Inha University Hospital, Inha University College of Medicine, Incheon, the Republic of Korea.
7. Department of Pediatrics, Chungbuk National University Hospital, Cheongju, the Republic of Korea.
8. Department of Pediatrics, Pusan National University Hospital, Pusan National University School of Medicine, Busan, the Republic of Korea.
9. Department of Pediatrics, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, the Republic of Korea.