1. Department of Advanced Prosthodontics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
2. Department of Bacteriology, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
3. Project Research Center for Nosocomial Infectious Diseases, Hiroshima University, Hiroshima, Japan
4. Antimicrobial Resistance Research Center, National Institute of Infectious Diseases, Tokyo, Japan
5. Department of Infectious Diseases, Hiroshima University Hospital, Hiroshima, Japan