1. Department of Public Health, Hyogo Medical University, Nishinomiya 663-8501, Hyogo, Japan
2. Department of Infection Control and Prevention, Hyogo Medical University, Nishinomiya 663-8501, Hyogo, Japan
3. Department of Legal Medicine, Hyogo Medical University, Nishinomiya 663-8501, Hyogo, Japan
4. Department of Respiratory Medicine and Hematology, Hyogo Medical University, Nishinomiya 663-8501, Hyogo, Japan
5. Department of Public Health Nursing, Mie University Graduate School of Medicine, Tsu 514-0001, Mie, Japan
6. The Research Foundation for Microbial Diseases of Osaka University, Kanonji 768-0065, Kagawa, Japan
7. Department of Microbiology, Hyogo Medical University, Nishinomiya 663-8501, Hyogo, Japan