Psychological effects on prolonged use of respiratory protective devices in children

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      <subfield code="a">In the study of psychological effects of prolonged use of a respiratory protective device, forty 7-10 year olds, fifty 12-15 year olds and twenty-eight 17-20 year olds participated subjects. Subjects in the experimental groups wore a full-face mask provided for civil defence in Sweden, and subjects in the control groups wore a filtering facepiece consisting of a tissue material covering the nose and mouth</subfield>
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      <subfield code="g">Vol. 34, nº 3, March 1991 ; p. 313-319</subfield>
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