Zhang, Xubin, Dangui Zhang, Chi Zhang, Lijun Yao, Lu Xu, Gengna Chen, Zhaohui Liao, Xunyi Zhu, Wenda Yang, and Weinan Li. “COVID-19 Outbreak Prevention by Early Containment in Shantou, China”. The Journal of Infection in Developing Countries 14, no. 07 (July 31, 2020): 742–747. Accessed April 24, 2024. https://jidc.org/index.php/journal/article/view/32794464.