1. Department of General Pediatrics; Tokyo Metropolitan Children's Medical Center; Tokyo Japan
2. Department of Quantitative Methods; Harvard School of Public Health; Boston Massachusetts USA
3. Division of Infectious Disease, Department of Pediatrics; Tokyo Metropolitan Children's Medical Center; Tokyo Japan
4. Division of Laboratory; Tokyo Metropolitan Children's Medical Center; Tokyo Japan
5. Department of Microbiology and Infectious Diseases; Toho University School of Medicine; Tokyo Japan
6. Division of Orthopedics; Tokyo Metropolitan Children's Medical Center; Tokyo Japan