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Variation in incidences of tuberculosis in subgroups of South African gold miners

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      <subfield code="a">To determine risk factors and to identify groups at high risk of tuberculosis among South African gold miners</subfield>
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      <subfield code="t">Occupational and environmental medicine</subfield>
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      <subfield code="g">Vol. 54, nº 9, September 1997 ; p. 636-641</subfield>
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