1. Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
2. Department of Hematology, Sainokuni Higashiomiya Medical Center, Saitama, Japan
3. Department of Respiratory Medicine, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
4. Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
5. Department of Laboratory Medicine, Keio University School of Medicine, Tokyo, Japan