한국소비자원 2022-02-18T01:36:01Z 2022-02-18T01:36:01Z 2022-02-17 2022-02-17 1003263334 https://www.kca.go.kr/eng/sub.do?menukey=6007&mode=view&no=1003263334 http://www.kca.go.kr/repo/handle/2015.oak/9561 132024 (2-1) Mask Guards May Reduce Protective Effect of Masks.pdf 한국소비자원 http://creativecommons.org/licenses/by-nc-nd/2.0/kr/ Mask Guards May Reduce Protective Effect of Masks news