1. Department of Microbiology and Infectious Diseases, Nara Medical University, Kashihara, Nara, Japan
2. Department of Clinical Laboratory, Naga Municipal Hospital, Kinokawa, Wakayama, Japan
3. Department of Medical Life Science, Kurashiki University of Science and Arts, Kurashiki, Okayama, Japan
4. Center of Infectious Diseases Nara Medical University, Kashihara, Nara, Japan