1. Department of Physical Medicine and Rehabilitation, Chonbuk National University Medical School, Jeonju, Korea.
2. Department of Rehabilitation, Hanyang University Medical Center, Seoul, Korea.
3. Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Ewha Womans University, Seoul, Korea.
4. Department of Rehabilitation Medicine, School of Medicine, Ewha Womans University, Seoul, Korea.