1. Department of Diagnostic Radiology; Tokyo Metropolitan Medical Center of Gerontology; Tokyo Japan
2. Department of Diagnostic Radiology; Yamagata University Faculty of Medicine; Yamagata Japan
3. Department of Radiology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
4. Department of Neurology; Tokyo Metropolitan Geriatric Hospital; Tokyo Japan
5. Department of Neurology and Neuroscience; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
6. Nishio Clinic; Nakatsugawa Japan