COVID-19(19) Patient(13) Trial(12) pandemic(11) clinical trial(10) Result(10) evaluate(8) COVID-19 pandemic(7) IMPROVE(7) Placebo(7) Enrollment(7) objective(7) Randomized(7) Treatment(7) effective(6) outcome(6) reduce(6) Efficacy(6) SARS-CoV-2(6) protocol(6) Tolerability(5) phase 2 trial(5) Support(5) reported(5) assigned(5) COVID-19 patient(5) randomized clinical trial(5) participant(5) receive(5) Safe(5)