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In 43 from 222 men (19.4%) employed in a coking plant a higher than normal concentration of fetal hemoglobin (HbF) was found, whereas an elevated level of HbF was detected in only two from 87 persons (2.3%) working in the cold rolling mill of the steel mill Huta Sendzimira , Krakow, Poland. Subjects employed in the coking mill worked in a much more polluted atmosphere than those in the cold rolling...
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