1. Department of Pathology & Applied Neurobiology, Kyoto Prefectural University of Medicine, Graduate School of Medical Science, Japan
2. Department of Neurology, Kyoto Yamashiro General Medical Center, Japan
3. Department of Neurosurgery, Kyoto Yamashiro General Medical Center, Japan
4. Department of Pathology, National Institute of Infectious Diseases, Japan
5. Department of Virology, National Institute of Infectious Diseases, Japan