1. Inpatients diagnosed with mild to moderated COVID-19 pneumonia (Infiltration in CXR and oxygen saturation (SpO2) equal or greater than 94% on room air. The CXR will be written by pulmonologists and/or radiologists at the first day of admission or the first day of perform CXR. 2. aged equal or greater than 18 years old

1. Inpatients diagnosed with mild to moderated COVID-19 pneumonia (Infiltration in CXR and oxygen saturation (SpO2) equal or greater than 94% on room air. The CXR will be written by pulmonologists and/or radiologists at the first day of admission or the first day of perform CXR. 2. aged equal or greater than 18 years old