1. Department of Neurology, National Cancer Center, Goyang, Korea.
2. Department of Neurology, Kosin University College of Medicine, Busan, Korea.
3. Department of Neurology, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4. Department of Neurology, Yeungnam University College of Medicine, Daegu, Korea.
5. Department of Neurology, Konkuk University School of Medicine, Seoul, Korea.
6. Department of Neurology, Ewha Womans University School of Medicine, Ewha Medical Research Institute, Seoul, Korea.