1. Department of Radiology, Cerebrovascular Center, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, Korea.
2. Department of Neurology, Cerebrovascular Center, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, Korea.
3. Department of Neurosurgery, Cerebrovascular Center, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, Korea.