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D000818:Animals; D002681:China; D004938:Esophageal Neoplasms / Q000209:etiology; D006801:Humans; D008113:Liver Neoplasms / Q000821:virology; D009303:Nasopharyngeal Neoplasms / Q000821:virology; D009374:Neoplasms, Experimental / Q000209:etiology