Study participants
This study was a retrospective observational study. All patients with
COVID-19 consecutively admitted to six wards in the Sino-French New City
Branch of Tongji Hospital, Huazhong University of Science and
Technology, from January 28 to March 9, 2020, were enrolled. Tongji
Hospital was designated to treat severe and critical COVID-19 patients
by the Wuhan government in January 2020. Follow-up of the clinical
outcomes of all patients was censored on March 27, 2020.