1. Department of Neurology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
2. Informatization Department, Ewha Womans University Seoul Hospital, Seoul, Korea.
3. Department of Occupational and Environmental Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
4. Department of Neurology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.