• Comparison of oseltamivir plus chloroquine vs. oseltamivir plus lopinavir/ritonavir in patients with mild COVID-19 and of lopinavir/ritonavir plus oseltamivir vs. darunavir/ritonavir plus oseltamivir vs. favipiravir plus lopinavir/ritonavir vs. darunavir/ritonavir plus oseltamivir plus chloroquine vs. darunavir/ritonavir plus favipiravir plus oseltamivir in patients with moderate to severe COVID-19.