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Original research
Effect of portable HEPA filters on COVID-19 period prevalence: an observational quasi-interventional study in German kindergartens

Authors

  1. Correspondence to Dr Timo Falkenberg; timo.falkenberg{at}ukbonn.de
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Citation

Falkenberg T, Wasser F, Zacharias N, et al
Effect of portable HEPA filters on COVID-19 period prevalence: an observational quasi-interventional study in German kindergartens

Publication history

  • Received January 30, 2023
  • Accepted July 18, 2023
  • First published July 30, 2023.
Online issue publication 
February 21, 2024

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