1. Department of Rehabilitation Medicine, Wonju Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea.
2. Department of Neurosurgery, College of Medicine, Chosun University, Gwangju, Korea.
3. Department of Rehabilitation Medicine and Research Institute, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Anatomy, Yonsei University Wonju College of Medicine, Wonju, Korea.