4Zhang X, Ke W, Xie J, et al. Comparison of effects of hepatitis E or A viral superinfection in patients with chronic hepatitis B. Hepatol Int, 2010, 4: 615-620.
5Ozasa A, Tanaka Y, Orito E, et al. Influence of genotypes and precore mutations on fulminant orchronic outcome of acute hepatitis B virus infection. Hepatology, 2006, 44: 326-334.