(2) WHO : Q&A on coronaviruses (COVID-19). https://www.who.int/emergencies/diseases/novel-coronavirus-2019/question-and-answers-hub/q-a-detail/q-a-coronaviruses
(3) unicef : Physical not social distancing. https://www.unicef.org/sudan/press-releases/physical-notsocial-distancing
(4) 厚生労働省 : 新型コロナウイルスを想定した「新しい生活様式」の実践例を公表しました. https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/0000121431_newlifestyle.html