1	Transfusion red blood cells	Exp Erythrocyte Transfusion/ OR (((Transfus* OR exchange OR infusion* OR retransfus*) adj3 (Red cell* OR red blood cell* OR RBC OR RBCs OR Erythrocyte* OR Normocyte*)) OR Erythroexchange* OR Erythro‐exchange*).ti,ab,kw,kf
2	Hospitalised	Exp Hospitals/ OR exp Hospital Units/ OR exp Hospital Medicine/ OR exp Emergency Service, Hospital/ OR exp Hospitalization/ OR exp Critical Care/ OR Surgical Procedures, Operative/ OR Postoperative Complications/ OR intraoperative complications/ OR exp blood loss, surgical/ OR Surgery.fs OR exp Specialties, Surgical/ OR exp Emergencies/ OR exp Emergency Medicine/ OR exp Inpatients/ OR child, hospitalized/ OR adolescent, hospitalized/ OR (Hospital* OR Operating room* OR Emergenc* OR Intensive care OR Critical care OR Acute care OR critically ill OR ICU OR ICUs OR NICU* OR PICU* OR Surger* OR Surgical* OR Operation OR Operations OR Operative* OR Postoperative* OR intraoperative* OR Inpatient*).ti,ab,kw,kf
3	Volume	Exp Erythrocyte Count/ OR exp Erythrocyte Volume/ OR (Volume* OR Quantit* OR Unit OR Units OR Size OR Amount* OR "mL kg" OR "cc kg" OR "mL per kg" OR "cc per kg" OR count OR counts OR mass OR masses OR (number* NOT Registration Number)).ti,ab,kw,kf
4	Not	(exp Animals/ NOT exp humans/) OR comment/ or editorial/ or letter/ or Cross‐Sectional Studies/ or case reports/ OR (Murine OR Rat OR Rats OR Mice OR Mouse* OR Cat OR Cats OR feline* OR Dog OR Dogs OR canine* OR Cattle OR Cow OR Cows OR Pig OR Pigs OR Sow OR Sows OR swine* OR rabbit*).ti,ab,kw,kf
5	Combination	((1 AND 2 AND 3) NOT 4) AND (english OR French).lg 1504 résultats