Patients
COVID-19 virologically verified adult patients admitted to hospital between Jul. 14, 2020 and Apr. 2, 2021, were recruited from Shanghai Public Health Clinical Center. Eligibility criteria for the trial were RT-PCR positive for SARS-CoV-2, men and non-pregnant women, age at least 18 years. Patients were diagnosed as mild or moderate COVID-19 cases based on the 