1. Department of Microbiology and Immunology, and Division of Bacterial Toxin, Research Center for Infectious Disease, Aichi Medical University, Nagakute, Aichi, Japan
2. Department of Microbiology and Immunology, and Division of Bacterial Toxin, Research Center for Infectious Disease, Aichi Medical University, Nagakute, Aichi, Japan,
3. Department of Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan