title: Frequency of hepatitis-B infections.
mesh_terms: D000293:Adolescent; D000328:Adult; D000906:Antibodies / Q000032:analysis; D006505:Hepatitis / Q000453:epidemiology*; D006511:Hepatitis B Antigens; D006801:Humans; D008875:Middle Aged; D009664:Norway
chemical_list: D000906:Antibodies; D006511:Hepatitis B Antigens