COVID-19(9) Diagnosis(8) Treatment(8) Cancer(8) Patient(8) conducted(5) reported(5) susceptibility(5) quantitative synthesis(4) systematic review(4) SARS-CoV-2.(4) diagnosis of COVID-19(4) Evidence(4) COVID-19 pandemic(4) high risk(4) lower risk(4) random(4) COVID-19 vaccine(4) proportion(4) articles(4) virus(4) individuals(4) infection risk(4) the Newcastle-Ottawa Scale(4) Odds ratio(4) Policy(4) COVID-19 incidence(4) article(4) while(4) performed(4)