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Baek, Y., In a breathtaking heat wave...If you want to wear a mask in a healthy way, https://newsis.com/view/?id=NISX20220704_0001930000&cID=10201&pID=10200
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K. Park, "Changes in respiratory function due to differences in mask blocking grade and effects on cardiovascular function during aerobic exercise with mask(unpublished master's thesis)," Kyungsung University, 2021.
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Daum Dictionary, Masks for health, https://dic.daum.net/word/view.do?wordid=kkw000960814&supid=kku011079957
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Oh, M., Wearing a mask is a way to protect me from COVID-19, https://www.jejutwn.com/news/article.html?no=140432
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Baek, M., Although it is mandatory to wear a mask, people with respiratory and cardiovascular diseases are at risk of breathing difficulties and headaches, https://www.joongang.co.kr/article/23897752
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D. Cho, Unmask and "non-scientific" each other...Based on the actual effect, SBS News, https://news.sbs.co.kr/news/endPage.do?news_id=N1006733409&plink=ORI&cooper=DAUM
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J. Lee, 20 million masks used per day...Generation of 1,000 tons of greenhouse gases, https://www.yna.co.kr/view/AKR20220826059900530?input=1179m
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