1. Department of Neurology, Inje University College of Medicine, Busan, Korea.
2. Department of Neurology, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Neurology, Hanyang University College of Medicine, Seoul, Korea.
4. Department of Neurology, Chungnam National University College of Medicine, Daejeon, Korea.
5. Department of Neurology, Korea University College of Medicine, Seoul, Korea.