1. Department of Neurology, Graduate School of Medicine, The University of Tokyo, Japan
2. Division of Microbiology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, Japan
3. Department of Neurosurgery, Graduate School of Medicine, The University of Tokyo, Japan
4. Department of Infectious Diseases, Graduate School of Medicine, The University of Tokyo, Japan
5. Division of Bioenvironmental Science, Frontier Science Research Center, University of Miyazaki, Japan