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Ekpreechakul, MD, MSc T, Saiphiroonthong, MD, MSc W, Chaiwong,BSc, MPH W. Letter to Editor: Quantitative Fit Test of Double Layer Surgical Masks . BKK Med J [Internet]. 2021Feb.27 [cited 2021Aug.1];17(1):70. Available from: https://he02.tci-thaijo.org/index.php/bkkmedj/article/view/249330