COVID-19(25) funding(23) finding(23) SARS-CoV-2(16) risk(15) Treatment(14) Brazil(12) positive(12) Primary outcome(11) Trial(11) Patient(11) outcome(10) death(10) reported(10) Placebo(10) Hospitalization(9) individual(9) with COVID-19(8) Randomly(8) age(8) risk factor(8) Analysis(8) Mortality(8) Effect(8) receive(8) vaccination(8) conducted(8) clinical benefit(7) 95% CI(7) randomized clinical trial(7)