1. Department of Physical Medicine and Rehabilitation, Eunpyeong Hospital, Seoul 122-913, Korea.
2. Department of Anatomy, School of Medicine, CHA University, Seongnam 463-070, Korea.
3. Department of Dentistry, CHA Bundang Medical Center, CHA University, Seongnam 463-070, Korea.
4. Department of Rehabilitation Medicine, CHA Bundang Medical Center, CHA University, Seongnam 463-070, Korea.