Analysis of hepatitis B virus variants in chronic cases by partial amplification of C, S and X genes - Souza, L.; Madruga, C. L. A.; Pinho, J. R. Rebello; Silva, L. C. da; Carrilho, Flair José; Takahashi, D. A. (International Congress of Virology, of International Union of Microbiological Societies, 2002)