Yasuhiro Asahina1, Namiki Izumi2, Kumada Hiromitsu3, Masayuki Kurosaki2, Kazuhiko Koike4, Fumitaka Suzuki3, Hajime Takikawa5, Atsushi Tanaka5, Eiji Tanaka6, Yasuhito Tanaka7, Hirohito Tsubouchi8, Norio Hayashi9, Naoki Hiramatsu10, Hiroshi Yotsuyanagi11. 1. Department of Gastroenterology and Hepatology, School of Medicine, Tokyo Medical and Dental University. 2. Department of Gastroenterology and Hepatology, Musashino Red Cross Hospital. 3. Department of Hepatology, Toranomon Hospital. 4. Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo. 5. Department of Medicine, Teikyo University School of Medicine. 6. The Second Department of Internal Medicine, Shinshu University School of Medicine. 7. Department of Virology and Liver Unit, Nagoya City University Graduate School of Medical Science. 8. Kagoshima City Hospital. 9. Kansai-Rosai Hospital. 10. Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine. 11. Department of Infectious Diseases, Graduate School of Medicine, The University of Tokyo.