1. Department of Infection Control Science, Osaka City University Graduate School of Medicine, Japan
2. Department of Infectious Disease Medicine, Osaka City University Hospital, Japan
3. Department of Respiratory Medicine, Osaka City University Graduate School of Medicine, Japan
4. Department of Medical Education and General Practice, Osaka City University Graduate School of Medicine, Japan
5. Department of Hematology, Osaka City University Hospital, Japan
6. Department of Bacteriology, Osaka City University Graduate School of Medicine, Japan