1. WHO Director-General’s Opening Remarks at the Media Briefing on COVID-19—11 March 2020
https://www.who.int/director-general/speeches/detail/who-director-general-s-opening-remarks-at-the-media-briefing-on-covid-19---11-march-2020
2. Ministry of Health and Welbeing, Public Advice & Notice
http://ncov.mohw.go.kr/tcmBoardView.do?brdId=3&brdGubun=31&dataGubun=&ncvContSeq=2489&contSeq=2489&board_id=311&gubun=ALL
3. Masks Are a Must Now! I Use it with Prime Minister Chung!;KDCA,2020
4. Ministry of Health and Wellbeing, Press Reference
http://ncov.mohw.go.kr/upload/viewer/skin/doc.html?fn=1651197423233_20220429105703.pdf&rs=/upload/viewer/result/202205/
5. COVID-19 preventive behaviors and influencing factors in the Iranian population; a web-based survey