Lamivudine treatment can overcome cytotoxic T-cell hyporesponsiveness in chronic hepatitis B: new perspectives for immune therapy. by Boni, C, Penna, A, Ogg, G, Bertoletti, A, Pilli, M, Cavallo, C, Cavalli, A, Urbani, S, Boehme, R, Panebianco, R, Fiaccadori, F, Ferrari, C