1. Department of Neurology, Research Institute and Hospital of National Cancer Center, Goyang-si, Korea
2. Department of Neurology, The Catholic University of Korea, Yeouido St. Mary’s hospital, Korea
3. Department of Neurology, College of Medicine, Yeungnam University College of Medicine, Korea
4. Department of Neurology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Korea
5. Department of Neurology, Ilsan Paik Hospital, Inje University College of Medicine, Korea
6. Department of Neurology, Korea University School of Medicine, Seoul, Korea