1. Department of Infectious Diseases, Keio University, School of Medicine, Tokyo, Japan
2. Department of Microbiology, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Tokyo, Japan
3. Department of Pediatrics, Hakujikai Memorial Hospital, Tokyo, Japan
4. Department of Pediatrics, Hiroshima City Funairi Citizens Hospital, Hiroshima, Japan
5. Pharmaceutical R&D Division, Meiji Seika Pharma, Tokyo, Japan
6. Departments of Infectious Diseases, National Cancer Center Hospital, Tokyo, Japan