1. Department of Neurology; Seoul Medical Center; Seoul Korea
2. Department of Neurology; Haeundae Paik Hospital; Inje University College of Medicine; Busan Korea
3. Department of Neurology; Kangdong Sacred Heart Hospital; Hallym University College of Medicine; Seoul Korea
4. Department of Radiology; Kangdong Sacred Heart Hospital; Hallym University College of Medicine; Seoul Korea