1. School of Biomedical Engineering, Konkuk University, Choongju, 380-701, Korea
2. Research Institute of Biomedical Engineering, Konkuk University, Choongju, 380-701, Korea
3. Department of Neurology, College of Medicine, Korea University, Ansan, Korea
4. Department of Neurology, College of Medicine, Korea University, Anam, Korea
5. Université libre de Bruxelles, Belgium