1. Department of Dermatology Gunma University Graduate School of Medicine Maebashi Japan
2. Department of Dermatology Kanazawa Medical University Kahoku‐gun Japan
3. Department of Neurology Gunma University Graduate School of Medicine Maebashi Japan
4. Department of Diagnostic Pathology Gunma University Hospital Maebashi Japan
5. Department of Infection Control and Prevention Center Gunma University Hospital Maebashi Japan
6. Gunma Prefectural Institute of Public Health and Environmental Sciences Maebashi Japan