1. 1. Dennis LK, Eugene Stephen H, Dan L, J Larry J, Anthony SF. Harrison's principles of internal medicine. 16 th ed Mc Graw-Hill,New York ,2004;1855 -60.
2. 2. Cohan N, Zandieh T, Samiei SH, Ataie Z, Kavari M. The prevalence and clinical significance Hepatitis B and C co-infection. Iran J Sci,2006; 31(3):156-159.
3. 3. Lok As, McMahon BJ. Chronic hepatitis B. Hepatology, 2001;34(6): 1225-1241. doi.org/10.1053/jhep.2001.29401
4. 4. Massarat MS, Tahaghoghi mehrizi S.Iranian national health survey: a brief report. Arch Iran Med, 2002;5(2): 73-79.
5. 5. Alavian SM, Fallahian F, Bagheri lankarani K. The changing epidemiology of viral Hepatitis Bin Iran 2007;16(4): 403-6.