1. Department of Rehabilitation Medicine, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
2. Biomedical Research Institute, Pusan National University, Busan, Korea.
3. Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Korea.
4. Department of Pediatrics, Pusan National University School of Medicine, Busan, Korea.
5. Department of Statistics, Pusan National University, Busan, Korea.