1. Department of Laboratory Medicine and Pathology (Neuropathology); Tokyo Metropolitan Neurological Hospital; Tokyo Japan
2. Department of Pathology; Saitama Medical University; Saitama Japan
3. Department of Neurology; Tokyo Metropolitan Neurological Hospital; Tokyo Japan
4. Department of Neurology; Tokyo Metropolitan Kita Medical and Rehabilitation Center for the Disabled; Tokyo Japan
5. Department of Epidemiology, Research Institute for Radiation Biology and Medicine; Hiroshima University; Hiroshima Japan