Result(10) Patient(9) COVID-19(8) Impact(8) Evidence(7) surgical(6) postoperative(6) Guidance(5) COVID-19 pandemic(5) Mortality(5) pandemic(5) median(4) systematic review(4) Cancer(4) reduction in(4) healthcare(4) pathway(4) Personal protective equipment(4) subsequent(4) recommendation(4) database(4) article(3) BCG(3) physical(3) BCG vaccination(3) SARS-CoV-2 infected patient(3) eight(3) Odds ratio(3) China(3) retrospective(3)