Sung Ho Jang1, Hyeok Gyu Kwon2. 1. Department of Physical Medicine and Rehabilitation, College of Medicine, Yeungnam University, 317-1, Daemyung dong, Namku, Daegu, 705-717, Republic of Korea. 2. Department of Physical Medicine and Rehabilitation, College of Medicine, Yeungnam University, 317-1, Daemyung dong, Namku, Daegu, 705-717, Republic of Korea. khg0715@hanmail.net.