1. Department of Neurology and Neurobiology of Aging, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan;
2. Department of Virology 1, National Institute of Infectious Diseases, Tokyo, Japan;
3. Department of Neurology, Fukui Red Cross Hospital, Fukui, Japan;
4. Department of Hematology, Fukui Red Cross Hospital, Fukui, Japan