Entecavir at Five Years Shows Long-Term Maintenance of High Genetic Barrier to Hepatitis B Virus Resistance - Tenney, DJ; Pokornowski, KA; Rose, RE; Baldick, CJ; Eggers, BJ; Fang, J; Yang, JY; Xu, D; Brett-Smith, H; Spiegelmacher, N; Schwendel, A; Pichl, T; Reeb, I; Colonno, RJ (Zeitschrift für Gastroenterologie, 2008)