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