1Department of Occupational Medicine, College of Medicine, Dankook University, Korea.
2Department of Preventive Medicine, College of Medicine, Dankook University, Korea. hojang@dku.edu
3Department of Rehabilitation Medicine, College of Medicine, Dankook University, Korea.
4Department of Rehabilitation Medicine, College of Medicine, Dongkook Univeristy, Korea.
5Department of Rehabilitation Medicine, College of Medicine, The Catholic University of Korea, Korea.
6Department of Rehabilitation Medicine, College of Medicine, Seoul national University, Korea.
7Department of Rehabilitation Medicine, College of Medicine, Soonchunhayng University, Korea.
8Department of Rehabilitation Medicine, College of Medicine, Donga University, Korea.
9Department of Rehabilitation Medicine, College of Medicine, Jeonnam National University, Korea.