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A randomised crossover trial of facemask efficacy
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    Facemask efficacy with spacers

    Dear Editor

    We read with interest the article on facemask efficacy trial by Hayden et al.[1] It is indeed an important area of research & very little work has been done in past addressed to this issue. We have few observations on the article, on which we solicit authors’ comments.

    1. Test group included in the study had a wide age variability requiring different sizes of facemasks. We wo...

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    Conflict of Interest:
    None declared.