1 Department of General ICU, the First Affiliated Hospital of Zhengzhou University, Henan Key Laboratory of Critical Care Medicine, Zhengzhou Key Laboratory of Sepsis, Zhengzhou 450052, Henan, China. Corresponding author: Sun Tongwen, Email: suntongwen@163.com [Sun Tongwen, the member of Coronavirus Disease 2019 (COVID-19) Expert Group from Health Commission of Henan Province, Secretary of the Communist Party in Department of Emergency Medicine, and director of the general ICU of the First Affiliated Hospital of Zhengzhou University].