1. Department of Physical Medicine and Rehabilitation, College of Medicine, Catholic University of Daegu, Daegu, Korea.
2. Medical Devices Clinical Trial Center, College of Medicine, Yeungnam University, Daegu, Korea.
3. Department of Physical Medicine and Rehabilitation, College of Medicine, Yeungnam University, Daegu, Korea.
4. Department of Medical Statistics, College of Medicine, Catholic University of Daegu, Daegu, Korea.