inclusion criteria: * age 18 years or older. * hospitalized covid-19 patients admitted to the hospital. * patients requiring supplemental oxygen. level 4 using the world health organization 7-point ordinal scale for clinical improvement * patients requiring corticosteroids (dexamethasone) according to hospital protocol.

inclusion criteria: * age 18 years or older. * hospitalized covid-19 patients admitted to the hospital. * patients requiring supplemental oxygen. level 4 using the world health organization 7-point ordinal scale for clinical improvement * patients requiring corticosteroids (dexamethasone) according to hospital protocol.

inclusion criteria: - age 18 years or older. - hospitalized covid-19 patients admitted to the hospital. - patients requiring supplemental oxygen. level 4 using the world health organization 7-point ordinal scale for clinical improvement - patients requiring corticosteroids (dexamethasone) according to hospital protocol.

inclusion criteria: - age 18 years or older. - hospitalized covid-19 patients admitted to the hospital. - patients requiring supplemental oxygen. level 4 using the world health organization 7-point ordinal scale for clinical improvement - patients requiring corticosteroids (dexamethasone) according to hospital protocol.