1. Department of Microbiology, Toho University School of Medicine, Tokyo
2. Nara Medical University, Nara
3. Kawasaki Medical School, Okayama
4. Saitama Medical School, Saitama
5. Hokkaido University Hospital, Sapporo
6. Tohoku University Graduate School of Medicine, Miyagi
7. Kanagawa Cardiovascular and Respiratory Diseases Center, Kanagawa, Japan