25 A case‐control study showed a borderline significant association between HBV and extrahepatic bile duct cancer using data of 1 825 316 cases and 200 000 controls from the Surveillance, Epidemiology and End Results (SEER) Medicare database among the elderly within the US population. 26 Experimental studies have found the presence of HBV DNA in bil
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Hepatitis B virus infection and the risk of gastrointestinal cancers among Chinese population: A prospective cohort study.
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