COVID-19(18) Patient(13) SARS-CoV-2(7) lung(6) correlated(6) Respiratory failure(6) performed(5) mechanical ventilation(5) Doppler(5) pilot study(5) strain(4) healthy volunteers(4) male(4) Regional(4) Self-Inflicted Lung Injury(4) Registration(4) ICU(4) ARDS(4) threshold(4) impedance(4) DRRS(4) dynamic(4) approach(4) develop(4) risk factor(4) intensive care unit(4) SARS-CoV-2 positive patient(4) clinical(4) patients(4) EIT(4)