1. Department of Neurosurgery, Buddhist Tzu-Chi General Hospital and Tzu-Chi University, Hualien, Taiwan, ROC
2. Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
3. Department of Radiology, Taipei Veterans General Hospital and School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, ROC
4. Department of Radiology, Far-Eastern Memorial Hospital, New Taipei City, Taiwan, ROC