1. Department of Emergency and Critical Care Medicine Dokkyo Medical University Mibu Japan
2. Department of Emergency Northern Okinawa Medical Center Nago Japan
3. Department of Respiratory Medicine Akita Kousei Medical Center Akita Japan
4. Clinical Laboratory Center Dokkyo Medical University Mibu Japan
5. Division of Infection Control Dokkyo Medical University Mibu Japan
6. Management Department of Biosafety and Experimental Animals National Institute of Infectious Diseases Tokyo Japan