#8 AND #7 AND #6
#8	TS=((Blood Loss AND Surgical) or (Blood Transfusion AND Autologous)) OR TS=(Autohaemotransfusion* or Auto haemotransfusion* or Autohemotransfusion* or Auto hemotransfusion* or Autotransfusion* or Auto‐transfusion* or (Autologous and (Blood or Plasma))) OR TS=((cell or blood or plasma) AND (salvage or save or saving))
#7	TS=((abdominal or abdomen or chest or thoracic or thorax or trunk) AND (trauma or traumatic or traumas or injur* or penetrat* or stab or stabbed or stabbing)) OR TS=((Wounds AND Penetrat*) and (abdominal or abdomen or chest or thoracic or thorax or trunk)) OR TS=((heart or cardiac or aortic or aorta*) and (rupture*)) OR TS=((Splenic or spleen or stomach or gastric) and (rupture* or burst*))
#6	#5 AND #4
#5	TS=(human*)
#4	#3 OR #2 OR #1
#3	TS=((singl* OR doubl* OR trebl* OR tripl*) SAME (blind* OR mask*))
#2	TS=(controlled clinical trial OR controlled trial OR clinical trial OR placebo)
#1	TS=(randomised OR randomized OR randomly OR random order OR random sequence OR random allocation OR randomly allocated OR at random OR randomized controlled trial)