COVID-19/epidemiology; COVID-19/therapy; Delivery of Health Care; Metabolic Diseases/therapy; Respiration, Artificial/methods; Air Pressure; Autopsy; Body Mass Index; COVID-19/complications; COVID-19/pathology; Cause of Death; Comorbidity; Delivery of Health Care/methods; Delivery of Health Care/organization & administration; Delivery of Health Care/standards; Endothelium, Vascular/pathology; Endothelium, Vascular/virology; Humans; Lung/blood supply; Lung/pathology; Lung/virology; Metabolic Diseases/complications; Metabolic Diseases/epidemiology; Metabolic Diseases/pathology; Neovascularization, Pathologic/mortality; Neovascularization, Pathologic/pathology; Neovascularization, Pathologic/virology; Pandemics; Pneumonia, Viral/complications; Pneumonia, Viral/epidemiology; Pneumonia, Viral/therapy; Pulmonary Embolism/mortality; Pulmonary Embolism/pathology; Pulmonary Embolism/therapy; Pulmonary Embolism/virology; Respiration, Artificial/standards; Respiratory Distress Syndrome/epidemiology; Respiratory Distress Syndrome/pathology; Respiratory Distress Syndrome/therapy; Respiratory Distress Syndrome/virology; Risk Factors; SARS-CoV-2/physiology