title: Epidemiology of hepatitis B surface antigen among mentally retarded individuals.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D006510:Hepatitis B Antibodies / Q000276:immunology; D006514:Hepatitis B Surface Antigens / Q000276:immunology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008607:Intellectual Disability / Q000276:immunology*; D008297:Male
chemical_list: D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens