blood lead ( pb-b ) concentration was measured for all the workers , urinary delta-aminolevulinic acid ( ala ) for 130 workers , erythrocyte alpha-aminolevulinic acid dehydratase ( ala-d ) activity for 59 workers , and blood hemoglobin concentration or 93 workers .
C0014792
erythrocyte
C0019046
hemoglobin