Laboratory confirmation of COVID-19 virus by RT-PCR or imaging findings consistent with COVID-19 Severe disease (respiratory rate more than 30 per minute, oxygen saturation less than 94%, or pulmonary infiltration more than 50% in both lungs) Age above 18 years Willingness to participate in this study

Laboratory confirmation of COVID-19 virus by RT-PCR or imaging findings consistent with COVID-19 Severe disease (respiratory rate more than 30 per minute, oxygen saturation less than 94%, or pulmonary infiltration more than 50% in both lungs) Age above 18 years Willingness to participate in this study