Malaysia Prevalence Malaysian COVID-19 Factors 2019 Adults Associated Factors Coronavirus Factor NHMS National Health and Morbidity Survey Selangor 15 Years Old Adult Advertising Associated Cases Chronic Kidney Disease Cigarette Clinical Features Cluster Community Comorbidities Correlates Diabetes E-Cigarette ED Electronic Epidemiology Erectile Dysfunction Exposure First Health Hypertension Important Invasive Ventilatory Support Male Population Men Non-Communicable Diseases Outbreak Population Promotion Second-hand Smoke Smoke Smoking Sociodemographic Tobacco Training Trend