Characterizing COVID-19 severity, epidemiology and SARS-CoV-2 genotypes in a regional business hub of China. Issue 2 (February 2021) - Yan, Yan; Liu, Bin; Ding, Hui; Wang, Xu; Dai, Yaping; Ding, Difei; Yu, Hui; Sha, Mingchao; Lui, Chunyan; Chantsalmaa, Davgadorj; Qiu, Yuanwang; Huang, Lihua; et al.