2.1. Design and Settings
This was a double-blind randomized clinical trial study that was performed in Rasool Akram Medical Complex and Firoozgar hospital in Tehran on 150 patients with COVID-19. The diagnosis of COVID-19 was made according to the opinion of the relevant physician based on clinical signs and PCR, paraclinical, or laboratory findings. Both hospitals are affiliated to the Iran University of Medical Sciences (IUMS) and observe the same country protocol to treat COVID-19 patients.