Buti M, Casado MA, Calleja JL, Salmerón J, Aguilar J, Rueda M, Esteban R Cost-effectiveness of two oral antiviral therapies, lamivudine and adefovir dipivoxil of HBeAg-negative chronic hepatitis B 40th Annual Meeting of the European Association for the Study of the Liver (EASL). Paris, France. 13-17 apr 2005