1. Division of Pediatric Neurology, Department of Pediatrics, Pediatric Epilepsy Clinics, Severance Children's Hospital, Epilepsy Research Institute, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Pediatrics, Inje University Sanggye Paik Hospital, Seoul, Korea.
3. Department of Pediatrics, Gangnam Severance Hospital, Seoul, Korea.