Quantitative variables are expressed as median [interquartile range]. Qualitative variables are expressed as number and percentage. †Dose regimen: Azithromycin 500mg QD for one day followed by 250mg QD for four days; HQC 400mg BID for one day followed by 200mg BID for four days. Abbreviations : FiO2: Fraction of inspired oxygen; HCQ: hydroxychloroquine; Lopinavir/r: lopinavir/ritonavir; QD: once a day; BID: two times a day.