1. World Health Organization.Coronavirus disease 2019 (COVID‐19) situation report – 51.2020. Accessed April 20 2022.https://www.who.int/docs/default‐source/coronaviruse/situation‐reports/20200311‐sitrep‐51‐covid‐19.pdf?sfvrsn=1ba62e57_10
2. Centers for Disease Control and Prevention.How COVID‐19 Spreads.2021. Accessed April 20 2022.https://www.cdc.gov/coronavirus/2019‐ncov/prevent‐getting‐sick/how‐covid‐spreads.html
3. World Health Organization.Protect Yourself through the 2Vs and 3Ws.2021. Accessed April 20 2022.https://www.who.int/india/act‐amplify/protect‐yourself‐through‐the‐2vs‐and‐3ws
4. Centers for Disease Control and Prevention.How to Protect Yourself & Others.2022. Accessed April 20 2022.https://www.cdc.gov/coronavirus/2019‐ncov/prevent‐getting‐sick/prevention.html
5. Korea Disease Control and Prevention Agency.National Rules of Conduct to Prevent COVID‐19.2020. Accessed April 20 2022.http://ncov.mohw.go.kr/duBoardList.do