Sendi H, Mehrab-Mohseni M, Shahraz S, Norder H, Alavian SM, Noorinayer B, Zali MR, Pumpens P, Bonkovsky HL, Magnius LO. CTL escape mutations of core protein are more frequent in strains of HBeAg negative patients with low levels of HBV DNA. J Clin Virol. 2009 Nov; 46(3):259-64.