1. Department of Pediatrics, Chonnam National University Medical School, Gwangju, Korea.
2. Department of Neurology, Chonnam National University Medical School, Gwangju, Korea.
3. Department of Neurology, Chonnam National University Hwasun Hospital, Hwasun, Korea.
4. Department of Pediatrics, Mi-Rae Children's Hospital, Gwangju, Korea.
5. Department of Pediatrics, Kwangju Christian Hospital, Gwangju, Korea.
6. Department of Pediatrics, Chosun University Hospital, Gwangju, Korea.