Evidence-Based Medicine, Coronavirus Infections/drug therapy, Pneumonia, Viral/drug therapy, Betacoronavirus, Unified Health System/organization & administration, Coronavirus Infections/epidemiology, Pneumonia, Viral/epidemiology, Pandemics/prevention & control, Comprehensive Health Care/organization & administration, Risk Groups, Noncommunicable Diseases/prevention & control, Off-Label Use, Clinical Trial Protocol, Anti-Retroviral Agents/therapeutic use, Ribavirin/therapeutic use, Ritonavir/therapeutic use, Lopinavir/therapeutic use, Chloroquine/therapeutic use, Hydroxychloroquine/therapeutic use, Azithromycin/therapeutic use, Prednisolone/therapeutic use, Oseltamivir/therapeutic use, Plasma/immunology, Zinc/therapeutic use, Vitamin D/therapeutic use, Ascorbic Acid/therapeutic use, Enoxaparin/therapeutic use, COVID-19