1. Department of Microbiology Kitasato University School of Medicine Sagamihara Kanagawa Japan
2. Department of Gastroenterology Internal Medicine Kitasato University School of Medicine Sagamihara Kanagawa Japan
3. Department of Genome Medical Sciences Project Research Institute National Center for Global Health and Medicine Ichikawa Chiba Japan
4. Department of Microbiology Faculty of Pharmaceutical Sciences Tokushima Bunri University Yamashiro‐cho Tokushima Japan
5. Department of Bacteriology Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Okayama Japan
6. Division of Hematology Kitasato University School of Allied Health Sciences Sagamihara Kanagawa Japan