title: Haemoglobin levels in Cardiff children of nursery school age.
mesh_terms: D000367:Age Factors; D000747:Anemia, Hypochromic / Q000188:drug therapy / Q000453:epidemiology; D002675:Child, Preschool; D005260:Female; D006452:Hemoglobinometry; D006801:Humans; D007501:Iron / Q000627:therapeutic use; D008297:Male; D012578:Schools, Nursery; D012621:Seasons; D012737:Sex Factors; D012923:Social Class; D014852:Wales
chemical_list: D007501:Iron