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Do face masks help? is not the question:

Ng, Qin Xiang ; De Deyn, Michelle Lee Zhi Qing ; Yeo, Wee Song
Proceedings of the National Academy of Sciences.  117 (2020)  44 - p. 27078-27079 , 2020
Link: https://doi.org/10.1073/pnas.2012241117