Effects of upper respiratory tract illness in a working population

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      <subfield code="a">The aim of the present  study was to assess the impact of upper respiratory tract illness on efficiency at work. This was done using the "after-effect" technique with measurements being taken before and after work and the difference between these giving an indication of efficiency over the day</subfield>
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      <subfield code="g">Vol. 47, nº 4, March 2004 ; p. 363-369</subfield>
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