Database	Period of search	Search strategy used
The Cochrane Hepato‐Biliary Group Controlled Trials Register	November 2008.	(Blood loss OR bleeding OR hemorrhage OR haemorrhage OR hemorrhages OR haemorrhages OR hemostasis OR haemostasis OR transfusion) AND (((liver OR hepatic OR hepato) AND (resection OR segmentectomy)) OR hepatectomy)
Cochrane Central Register of Controlled Trials (CENTRAL) in The Cochrane Library	Issue 4, 2008	#1 Blood loss OR bleeding OR hemorrhage OR haemorrhage OR hemorrhages OR haemorrhages OR hemostasis OR haemostasis OR transfusion #2 MeSH descriptor Hemorrhage explode all trees #3 MeSH descriptor Blood Transfusion explode all trees #4 (#1 OR #2 OR #3) #5 liver OR hepatic OR hepato #6 MeSH descriptor Liver explode all trees #7 (#5 OR #6) #8 resection OR segmentectomy #9 (#7 AND #8) #10 hepatectomy #11 MeSH descriptor Hepatectomy explode all trees #12 (#9 OR #10 OR #11) #13 (#4 AND #12)
MEDLINE (Pubmed)	January 1951 to November 2008	(Blood loss OR bleeding OR hemorrhage OR haemorrhage OR hemorrhages OR haemorrhages OR hemostasis OR haemostasis OR transfusion OR "Hemorrhage"[Mesh] OR "Blood Transfusion"[Mesh]) AND (((liver OR hepatic OR hepato OR "liver"[MeSH]) AND (resection OR segmentectomy)) OR hepatectomy OR "hepatectomy"[MeSH]) AND (((randomized controlled trial [pt] OR controlled clinical trial [pt] OR randomized controlled trials [mh] OR random allocation [mh] OR double‐blind method [mh] OR single‐blind method [mh] OR clinical trial [pt] OR clinical trials [mh] OR ("clinical trial" [tw]) OR ((singl* [tw] OR doubl* [tw] OR trebl* [tw] OR tripl* [tw]) AND (mask* [tw] OR blind* [tw])) OR (placebos [mh] OR placebo* [tw] OR random* [tw] OR research design [mh:noexp]) NOT (animals [mh] NOT human [mh]))))
EMBASE (Ovid SP)	January 1980 to November 2008	1 exp CROSSOVER PROCEDURE/   2 exp DOUBLE BLIND PROCEDURE/   3 exp SINGLE BLIND PROCEDURE/   4 exp RANDOMIZED CONTROLLED TRIAL/   5 (((RANDOM* or FACTORIAL* or CROSSOVER* or CROSS) and OVER*) or PLACEBO* or (DOUBL* and BLIND*) or (SINGL* and BLIND*) or ASSIGN* or ALLOCAT* or VOLUNTEER*).af.   6 1 or 2 or 3 or 4 or 5   7 exp BLEEDING/   8 exp Blood Transfusion/   9 (Blood loss or bleeding or hemorrhage or haemorrhage or hemorrhages or haemorrhages or hemostasis or haemostasis or transfusion).af.   10 8 or 7 or 9   11 (liver or hepatic or hepato).af.   12 (segmentectomy or resection).af.   13 11 and 12 14 hepatectomy.af.   15 exp Liver Resection/   16 13 or 15 or 14 17 6 and 16 and 10
Science Citation Index Expanded (http://portal.isiknowledge.com)	January 1970 to November 2008	#1 TS=(Blood loss OR bleeding OR hemorrhage OR haemorrhage OR hemorrhages OR haemorrhages OR hemostasis OR haemostasis OR transfusion) #2 TS=(((liver OR hepatic OR hepato) AND (resection OR segmentectomy)) OR hepatectomy) #3 TS=(random* OR blind* OR placebo* OR meta‐analysis) #4 #3 AND #2 AND #1