title: Confounders, Mediators, and Selection Bias.
authors: Department of Emergency Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC.
authors: Timothy F
authors: TF
authors: Platts-Mills
authors: Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC.
authors: Charles
authors: C
authors: Poole
mesh_terms: D001803:Blood Transfusion; D006801:Humans; D012769:Shock / Q000401:mortality*; D014111:Tourniquets / Q000009:adverse effects*; D014947:Wounds and Injuries / Q000401:mortality*