1. Department of Emergency Medicine, School of Medicine, Kyungpook National University, Daegu, Korea.
2. Department of Pediatrics, Yeungnam University College of Medicine, Yeungnam University Hospital, Daegu, Korea.
3. Department of Pediatrics, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
4. Department of Pediatrics, School of Medicine, Kyungpook National University, Daegu, Korea.