1) Echevarria JM, Avellon A:Hepatitis B Virus genetic diversity. J Med Virol 78:S36-S42, 2006
2) Kobayashi M, Suzuki F, Arase Y, et al:Infection with hepatitis B virus genotype A in Tokyo, Japan during 1976 through 2001. J Gastroenterol 39:844-850, 2004
3) Suzuki Y, Kobayashi M, Ikeda K, et al:Persistence of acute infection with hepatitis B virus genotype A and treatment in Japan. J Med Virol 76:33-39, 2005
4) Ohnuma H, Yoshikawa A, Mizoguchi H, et al:Characterization of genotype H hepatitis B virus strain identified for the first time from a Japanese blood donor by nucleic acid amplification test. J Gen Virol 86:595-599, 2005
5) Shibayama T, Masuda G, Ajisawa A, et al:Characterization of seven genotypes(A to E, G and H)of hepatitis B virus recovered from Japanese patients infected with human immunodeficiency virus type 1. J Med Virol 76:24-32, 2005
6) Norder H, Courouce A-M, Coursaget P, et al:Genetic diversityof hepatitis B virus strains derived worldwide:genotypes, subgenotypes, and HBsAg subtypes. Intervirology 47:289-309, 2004