1. Department of Microbiology, School of Pharmacy, Aichi Gakuin University, Nagoya, Aichi, Japan
2. Department of Oral Medical Science, School of Dentistry, Ohu University, Koriyama, Fukushima, Japan
3. Pathogenic Microbe Laboratory, Research Institute, National Center for Global Health and Medicine, Shinjuku, Tokyo, Japan
4. Biological Resource Center (NBRC), National Institute of Technology and Evaluation (NITE), Kisarazu, Chiba, Japan