COVID-19(53) SARS-CoV-2(40) ACE2(16) lung(14) Patient(12) Concentration(11) ARDS(11) in vitro(10) Respiratory failure(10) Cell(10) coronavirus(10) angiotensin-converting enzyme 2(9) Pneumonia(8) effective(8) cellular(8) acute respiratory distress syndrome(8) coronavirus disease(8) therapy(7) less(7) Treatment(7) TGF-β1(7) Lung injury(7) airway(7) renin-angiotensin system(7) determine(7) acute respiratory syndrome(7) acute respiratory distress(7) virus infection(6) drug(6) Critical(6)