Comparison of lopinavir/ritonavir or hydroxychloroquine in patients with mild coronavirus disease (COVID‐19)  Drug: lopinavir/ritonavir, Drug: hydroxychloroquine sulfate  Korea/COVID‐19  150, all, 16 years to 99 years  Treatment  Experimental: lopinavir/ritonavir 200 mg/100 mg 2 tablets by mouth, every 12 hr for 7–10 days