1. Statistical report on internet development in China (the 44th survey report);China Internet Network Information Center (CNNIC),2019
2. Statement on the second meeting of the International Health Regulations (2005) Emergency Committee regarding the outbreak of novel coronavirus (2019-nCoV);World Health Organization (Who),2020
3. Coronavirus COVID-19 global cases by the center for systems science and engineering (CSSE) at Johns Hopkins University (JHU);Johns Hopkins University (Jhu),2020
4. How to protect yourself & others. Coronavirus Disease 2019 (COVID-19);Centers for Disease Control and Prevention (Cdc),2020
5. A Conceptual Model of Service Quality and Its Implications for Future Research