Corrigendum: Characterization of SARS-CoV-2 Variants N501Y.V1 and N501Y.V2 Spike on Viral Infectivity - Tang, Haijun; Gao, Long; Wu, Zhao; Meng, Fang; Zhao, Xin; Shao, Yun; Shi, Xiaohua; Qiao, Shigang; An, Jianzhong; Du, Xiaohong; Qin, F. Xiao-Feng (Frontiers in Cellular and Infection Microbiology, 2021)