[1]
Ekpreechakul, MD, MSc, T., Saiphiroonthong, MD, MSc, W. and Chaiwong,BSc, MPH, W. 2021. Letter to Editor: Quantitative Fit Test of Double Layer Surgical Masks . The Bangkok Medical Journal. 17, 1 (Feb. 2021), 70. DOI:https://doi.org/10.31524/bkkmedj.2021.15.001.