1. Division of Health Sciences; Graduate School of Medical Sciences, Kanazawa University; Ishikawa Japan
2. Radiological center; University of Fukui Hospital; Fukui Japan
3. Department of Radiology; Shiga University of Medical Science Hospital; Shiga Japan
4. Department of Radiology; University of Miami; Miami Florida USA
5. Department of Neurosurgery and Restorative Neuroscience; Graduate School of Medical Sciences, Nagoya City University; Aichi Japan
6. Department of Radiology; Kanazawa University Hospital; Ishikawa Japan