COVID-19(98) SARS-CoV-2(71) Patient(45) coronavirus(41) Inflammation(32) Infection(32) acute respiratory syndrome(31) pandemic(31) mechanism(28) disease(28) coronavirus disease(25) SARS-COV-2 infection(24) virus(23) ACE2(22) caused(22) Effect(22) Treatment(21) lung(21) patients(20) death(19) involved(19) addition(19) COVID-19 patient(19) Evidence(19) age(17) pathophysiology(17) Cell(17) Mortality(17) the disease(17) outcome(16)