COVID-19 severity assessment
Judged by clinical and radiological findings, patients were assigned into two groups of non-severe, and severe COVID-19 infection:
Non-severe infection was defined as mild symptoms (e.g., cough, fever, and change in smell/taste) without dyspnea.
Severe infection was defined as clinical or radiographic evidence of lower respiratory tract disease; respiratory rate ≥ 30 breaths/min or lung infiltrates on chest computed tomography scan (CT-scan); oxygen saturation might be lower than 94%.