Corrigendum: Potential Mechanisms of Action of Chinese Patent Medicines for COVID-19: A Review - Zhi-Hua Yang; Zhi-Hua Yang; Bin Wang; Qian Ma; Qian Ma; Lin Wang; Lin Wang; Ya-Xin Lin; Hai-Feng Yan; Hai-Feng Yan; Zi-Xuan Fan; Zi-Xuan Fan; et al. (Frontiers Media S.A., 2021)