COVID-19 positive patient(1) Abstract(1) surgical(1) individual(1) Venous Thromboembolism(1) body mass index(1) total population(1) Research(1) operative(1) examined(1) group(1) increase(1) patients(1) COVID-19 pandemic(1) baseline(1) criteria(1) Intervention(1) increased risk(1) FDA(1) syndrome(1) COVID(1) PCR(1) Lower(1) tested(1) age(1) required(1) Care(1) ARDS(1) sustained(1) Spinal cord injury(1)