1. Adults (above 18 years) 2. Admitted to the hospital 3. Confirmed COVID-19 patient by RT-PCR test from any specimen (nasal, throat swab, sputum, etc) 4. On oxygen supplement ( Category 4, 5, 6, 7 on the ordinal scale)

1. Adults (above 18 years) 2. Admitted to the hospital 3. Confirmed COVID-19 patient by RT-PCR test from any specimen (nasal, throat swab, sputum, etc) 4. On oxygen supplement ( Category 4, 5, 6, 7 on the ordinal scale)