1. Kanazawa University Graduate School of Medical Science, Kanazawa, JapanIshikawa Prefecture Central Hospital, Kanazawa, Japan
2. Fujii Neurosurgical Hospital, Kanazawa, Japan
3. Ishikawa Prefecture Central Hospital, Kanazawa, Japan
4. Ishikawa Prefectural Institute of Public Health and Environmental Science, Kanazawa, Japan
5. National Institute of Infectious Diseases, Tokyo, Japan
6. Kanazawa University Graduate School of Medical Science, Kanazawa, Japan