1. Department of Pediatrics, Jeonbuk National University Medical School, Jeonju, Korea.
2. Research Institute of Clinical Medicine of Jeonbuk National University, Jeonju, Korea.
3. Biomedical Research Institute of Jeonbuk National University Medical School, Jeonju, Korea.
4. Clinical Speech Pathology of Jeonbuk National University, Jeonju, Korea.