6Carman WF,Jacyna MR, Hanziyannis, et al. Mutation preventing formation of hepatitis B eantigen in patients with chronic hepatitis B virus infection[J]. Laneet, 1989,2: 588 - 590
7Hunt CM, McGill JM, Allen MI, et al. Clinical relevance of hepatitis B viral mutations[J]. Hepatology, 2000,31(5) : 1037 - 1044