1. Department of PediatricsOsaka General Medical Center Osaka Japan
2. Division of Epidemiology and PreventionAichi Cancer Center Research Institute Nagoya Japan
3. Department of PediatricsKurume University Medical Center Kurume Japan
4. Department of Pediatric Hepatology and GastroenterologySaiseikai Yokohama City Tobu Hospital Yokohama Japan
5. Department of PediatricsOsaka University Hospital Suita Japan
6. Department of PediatricsMiyagi Children's Hospital Sendai Japan
7. Department of Pediatrics and NeonatologyNagoya City University Graduate School of Medical Sciences Nagoya Japan
8. Department of Microbiology/ImmunologyState University of New York at Buffalo New York
9. Department of Virology and Liver UnitNagoya City University Graduate School of Medical Sciences Nagoya Japan