1. Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan.
2. Rinku General Medical Center, Osaka, Japan.
3. Tokyo Metropolitan Ebara Hospital, Tokyo, Japan.
4. Osaka City General Hospital, Osaka, Japan.
5. Tokyo Metropolitan Bokutoh Hospital, Tokyo, Japan.
6. Japanese Red Cross Narita Hospital, Chiba, Japan.
7. Kyoto City Hospital, Kyoto, Japan.
8. Yokohama Municipal Citizen's Hospital, Kanagawa, Japan.
9. Nara Medical University Hospital, Nara, Japan.
10. Sapporo City General Hospital, Hokkaido, Japan.
11. Toyama University Hospital, Toyama, Japan.
12. Kagawa Prefectural Central Hospital, Kagawa, Japan.
13. Japanese Red Cross Nagoya Daini Hospital, Aichi, Japan.
14. Nagoya City University East Medical Center, Aichi, Japan.
15. Graduate School of Medicine Faculty of Medicine, Osaka University, Osaka, Japan.