COVID-19(19) Result(12) hospital(11) Patient(10) pandemic(10) surgical(7) COVID-19 pandemic(7) positive(6) collected(5) Cohort(5) with COVID-19(5) SARS-CoV-2(5) identify(5) Evidence(4) outcome(4) Prognostic marker(4) Treatment(4) clinics(4) biochemical(3) collected data(3) Europe(3) Surgical skills(3) statistical(3) positive swab(3) Diagnosis(3) caused(3) died(3) Symptoms(3) prognostic indicators(3) LDH(3)