The Impact of Active Screening and Management on COVID-19 in Plateau Region of Sichuan, China oleh Jia-jie Lu, Guo-guo Jiang, Xiang He, Xiang He, Kai-ju Xu, Hong Yang, Rui Shi, Rui Shi, Ying Chen, Yu-yao Tan, Lang Bai, Hong Tang, Guo-ping Li, Guo-ping Li