1. Department of Diagnostic Radiology, Inje University Busan Paik Hospital, Busan, Korea;
2. Department of Neurosurgery, Inje University Haeundae Paik Hospital, Busan, Korea;
3. Department of Neurology, Inje University Buasn Paik Hospital, Busan, Korea;
4. Department of Neurosurgery, Inje University Busan Paik Hospital, Busan, Korea