title: Hepatitis Bs-antigen among blood donors in Ankara.
mesh_terms: D000293:Adolescent; D000328:Adult; D001782:Blood Donors; D006514:Hepatitis B Surface Antigens / Q000032:analysis*; D006801:Humans; D008875:Middle Aged; D014421:Turkey
chemical_list: D006514:Hepatitis B Surface Antigens