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デンマークの試験：Effectiveness of Adding a Mask Recommendation to Other Public Health Measures to Prevent SARS-CoV-2 Infection in Danish Mask Wearers
https://www.acpjournals.org/doi/10.7326/M20-6817

フランスでの試験：Surgical Mask to Prevent Influenza Transmission in Households: A Cluster Randomized Trial
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2984432/

日本での調査：サージカルマスクのインフルエンザ予防効果
https://www.thcu.ac.jp/uploads/imgs/20171024085000.pdf

1981年イングランドでの試験：Is a mask necessary in the operating theatre?
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2493952/pdf/annrcse01509-0009.pdf