title: Epidemiologic studies in viral hepatitis. Introduction.
mesh_terms: D000413:Alaska; D000914:Antibodies, Viral / Q000032:analysis; D001208:Asia; D006116:Greenland; D006506:Hepatitis A / Q000453:epidemiology; D006514:Hepatitis B Surface Antigens / Q000032:analysis; D006525:Hepatitis, Viral, Human / Q000453:epidemiology*; D006507:Hepatovirus / Q000276:immunology; D006801:Humans; D014481:United States
chemical_list: D000914:Antibodies, Viral; D006514:Hepatitis B Surface Antigens