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3. The normal haemoglobin level during the first year of life: revised figures;Mackay, H.M.M.;Arch Dis Child,1933
4. Haemoglobin levels in normal infants aged 3 to 24 months, and the effect of iron;Burman, D.;Arch Dis Child,1972
5. Epidemiology of hypochromic anaemia in young children;Stevens, D.;Arch Dis Child,1991