/www.cdc.gov/coronavirus/2019-ncov/symptoms-testing/testing.html" target="_blank"> CDC-selfchecker</a></li> (coronavirus self-test tool)
              <li><a href="https://covid19.healthdata.org/projections" target="_blank"> Coronavirus Data</a></li> (The cisualization shows the data of coronavirus for all 50 states, so that cities and states can best prepare)
              <li><a href="https://ncov.dxy.cn/" target="_blank"> Dingxiangyuan</a></li> (Update national daily data and educate Coronavirus knowledg