1. Department of Radiology, Yeungnam University Medical Center, Daegu, Republic of Korea;
2. Department of Radiology, College of Medicine, Yeungnam University, Daegu, Republic of Korea;
3. Department of Radiology, Kyungpook National University Hospital, Daegu, Republic of Korea;
4. Department of Radiology, School of Medicine, Kyungpook National University, Daegu, Republic of Korea;
5. Department of Neurosurgery, Kyungpook National University Hospital, Daegu, Republic of Korea