title: Beware of transfusion-related confounders in studies on packed red blood cells.
authors: Nishith K
authors: NK
authors: Singh
mesh_terms: D015986:Confounding Factors, Epidemiologic; D003422:Critical Care / Q000592:standards*; D017707:Erythrocyte Transfusion / Q000009:adverse effects* / Q000451:nursing / Q000592:standards; D006801:Humans; D007362:Intensive Care Units / Q000592:standards; D017410:Practice Guidelines as Topic