title: Occurrence of hepatitis B surface antigen in patients with Down's syndrome.
mesh_terms: D002648:Child; D002675:Child, Preschool; D004314:Down Syndrome / Q000276:immunology*; D005260:Female; D006514:Hepatitis B Surface Antigens / Q000302:isolation & purification*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male
chemical_list: D006514:Hepatitis B Surface Antigens