1. Department of Critical Care Medicine, Hospital of the University of Occupational and Environmental Health, Kitakyushu, Japan
2. Department of Microbiology, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan
3. Department of Bacteriology II, National Institute of Infectious Diseases, Tokyo, Japan
4. Department of Microbiology, Osaka City Institute of Public Health and Environmental Sciences, Osaka, Japan
5. Radioisotope Research Center, Facility for Education and Research Support, University of Occupational and Environmental Health, Kitakyushu, Japan
6. Department of Laboratory and Transfusion Medicine, Hospital of the University of Occupational and Environmental Health, Kitakyushu, Japan