1. Department of Pediatrics, Chungnam National University College of Medicine, Chungnam National University Hospital, Daejeon, Korea.
2. Department of Pediatrics, College of Medicine, Hallym University, Kangdong Sacred Heart Hospital, Seoul, Korea.
3. Department of Emergency Medicine, Seoul National University Hospital, Seoul, Korea.
4. Department of Pediatrics, Daejeon Eulgi Medical Center, Eulji University, Daejeon, Korea.
5. Department of Pediatrics, Chungnam National University College of Medicine, Chungnam National University Sejong Hospital, Sejong, Korea.