Efficiency of different grouping schemes for dust exposure in the European carbon black respiratory morbidity study

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      <subfield code="a">The aim of this study was to assess the theoretical efficiencies of different grouping strategies and its effect on the exposure-response relation in a study of respiratory morbidity associated with exposure to total inhalable and respirable carbon black dust</subfield>
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      <subfield code="g">Vol. 54, nº 10, October 1997 ; p. 714-719</subfield>
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