[Studies on the relationship of duck hepatoma and duck hepatitis B virus in a high incidence area of human hepatoma].
D000818:Animals; D006528:Carcinoma, Hepatocellular / Q000382:microbiology / Q000662:veterinary*; D004372:Ducks; D006509:Hepatitis B / Q000662:veterinary*; D006515:Hepatitis B virus / Q000648:ultrastructure*; D008113:Liver Neoplasms / Q000382:microbiology / Q000662:veterinary*; D011201:Poultry Diseases / Q000382:microbiology*