1. Department of Neurology; Geriatrics Research Institute and Hospital; Maebashi Gunma Japan
2. Department of Neurosurgery; Geriatrics Research Institute and Hospital; Maebashi Gunma Japan
3. Department of Pathology; Geriatrics Research Institute and Hospital; Maebashi Gunma Japan
4. Department of Internal Medicine; Geriatrics Research Institute and Hospital; Maebashi Gunma Japan