[1] | Chinese Center for Disease Control and Prevention. Technical documents for COVID-19 prevention and control. http://www.chinacdc.cn/jkzt/crb/zl/szkb_11803/jszl_11815/202003/t20200309_214241.html. [2020-3-9]. (In Chinese)http://www.chinacdc.cn/jkzt/crb/zl/szkb_11803/jszl_11815/202003/t20200309_214241.html |