1. Division of Infectious Diseases, Advanced Clinical Research Center, the Institute of Medical ScienceThe University of Tokyo Tokyo Japan
2. Department of PediatricsGeneral Medical Center Osaka, Japan
3. Department of Hepatobiliary SurgeryKobe University Kobe Japan
4. Department of GastroenterologyKurume University Japan
5. Department of Gastroenterology and MetabolismHiroshima University Japan
6. Department of GastroenterologyHokkaido University Japan
7. Department of GastroenterologyOkayama University Japan
8. Department of GastroenterologyRed Cross Hospital Musashino Japan
9. Department of GastroenterologyNagoya University Japan
10. Department of Virology and Liver UnitNagoya City University Graduate School of Medical Sciences Nagoya Japan