title: Serum vitamin B12 concentrations in children.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D005260:Female; D006402:Hematologic Diseases / Q000097:blood; D006801:Humans; D007223:Infant; D008297:Male; D011863:Radioimmunoassay; D014805:Vitamin B 12 / Q000097:blood*
chemical_list: D014805:Vitamin B 12