1. Department of Physical Medicine and Rehabilitation, Research Institute of Clinical Medicine, Chonbuk National University Medical School and Hospital, Jeonju, Korea.
2. Department of Neurosurgery, Research Institute of Clinical Medicine, Chonbuk National University Medical School and Hospital, Jeonju, Korea.
3. Department of Orthopedic Surgery, Research Institute of Clinical Medicine, Chonbuk National University Medical School and Hospital, Jeonju, Korea.