Sung Ho Jang1, Chul Hoon Chang2, Young Jin Jung2, Jeong Pyo Seo3. 1. Department of Physical Medicine and Rehabilitation, College of Medicine, Yeungnam University, Taegu, Republic of Korea. 2. Department of Neurosurgery, College of Medicine, Yeungnam University, Taegu, Republic of Korea. 3. Department of Physical Medicine and Rehabilitation, College of Medicine, Yeungnam University, Taegu, Republic of Korea raphael0905@hanmail.net.