[1] Kanazawa Univ, Kanazawa, Ishikawa, Japan
[2] Natl Inst Adv Ind Sci & Technol, Computat Biol Res Ctr, Biol Network Team, Tokyo, Japan
[3] Nagoya City Univ, Sch Med, Dept Virol & Liver unit, Nagoya, Aichi 467, Japan
[4] Univ Tokyo, Grad Sch Med, Dept Human Genet, Tokyo, Japan
[5] Natl Ctr Global Hlth & Med, Res Ctr Hepatitis & Immunol, Chiba, Japan