1. Department of Neurology, Pusan National University Hospital, Pusan National University School of Medicine and Biomedical Research Institute, Busan, Korea.
2. Department of Neurology, Haeundae Paik Hospital, Inje University, Busan, Korea.
3. Department of Neurology, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4. Department of Neurology, Kyung Hee University Hospital, Kyung Hee University College of Medicine, Seoul, Korea.
5. Department of Neurology, Dong-A University College of Medicine, Busan, Korea.