Wang W, Wang Y, Zhang X, Jia X, Li Y, Dang S
Using WeChat, a Chinese Social Media App, for Early Detection of the COVID-19 Outbreak in December 2019: Retrospective Study
JMIR Mhealth Uhealth 2020;8(10):e19589
URL: mhealth.jmir.org/2020/10/e19589
DOI: 10.2196/19589
PMID: 32931439