1. Department of Neurology, The Catholic University of Korea College of Medicine, Seoul, Korea.
2. Department of Neurology, Research Institute and Hospital of National Cancer Center, Goyang, Korea.
3. Department of Neurology, Kosin University College of Medicine, Busan, Korea.
4. Department of Neurology, Yeungnam University College of Medicine, Daegu, Korea.
5. Department of Neurology, Inje University Ilsan Paik Hospital, Goyang, Korea.
6. Department of Radiolgoy, Research Institute and Hospital of National Cancer Center, Goyang, Korea.