1. Department of Microbiology, Tokyo Medical University, Tokyo, Japan
2. Tokyo University, Tokyo, Japan
3. Toho University, Tokyo, Japan
4. Teikyo University, Tokyo, Japan
5. Surugadai Nihon University Hospital, Tokyo, Japan
6. Nakano Sogo Hospital, Tokyo, Japan
7. Toranomon Hospital, Tokyo, Japan
8. Tokyo Medical and Dental University, Tokyo, Japan
9. Nihon University Itabashi Hospital, Tokyo, Japan
10. Dokkyo Medical University, Tochigi, Japan
11. Miyazaki University, Miyazaki, Japan