1. Benvegnu L, Fattovich G, Noventa F, Tremolada F, Chemello L, Cecchetto A, Alberti A (1994) Concurrent hepatitis B and C virus infection and risk of hepatocellular carcinoma in cirrhosis. A prospective study. Cancer 74: 2442–2448
2. Cui LH, Fang JN, Jin HZ, Quan ZY, Jin CJ (1999) An analysis of the interaction of Hepatitis virus in primary hepatocellular carcinoma in Korean of Yanbian. Chin J Prev Control Chron Non-commun Dis 7: 28–30
3. Dai M, Shi Y, Zhang JY, Zhou YF, Zhang MX, He Z (1998) A study of the interaction of HBV and HCV in PHC. Henan J Oncol 11: 81–83
4. DerSimonian R, Laird N (1986) Meta-analysis in clinical trials. Control Clin Trials 7: 177–188
5. Ding BG, Fan DM, Mu LN, Yu SZ (2004) A case–control study of hepatitis B virus, hepatitis C virus and liver cancer. Chin J Epidemiol 25: 22