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A randomised crossover trial of facemask efficacy
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  1. Correspondence to:
    Dr P W Barry
    Clinical Sciences Building, Leicester Royal Infirmary, Leicester LE2 7LX, UK; pwb1btinternet.com
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Citation

Hayden JT, Smith N, Woolf DA, et al
A randomised crossover trial of facemask efficacy

Publication history

  • Accepted March 14, 2003
  • First published January 7, 2004.
Online issue publication 
January 07, 2004

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