Dose‐dependent effects of red blood cell transfusion and case mix index on venous thromboembolic events in spine surgery. - Lo, Brian D.; Qayum, Omar; Penberthy, Kristen K.; Gyi, Richard; Lester, Laeben C.; Hensley, Nadia B.; Sciubba, Daniel M.; Frank, Steven M.; Cho, Brian C. (Vox Sanguinis, 2023)