Blood transfusions.
D001771:Blood Banks / Q000458:organization & administration; D001788:Blood Grouping and Crossmatching; D001803:Blood Transfusion / Q000592:standards* / Q000639:trends; D003422:Critical Care / Q000592:standards / Q000639:trends; D016638:Critical Illness; D005260:Female; D006650:Histocompatibility Testing; D006801:Humans; D008297:Male; D018570:Risk Assessment; D016896:Treatment Outcome