Database	Time span	Search strategy
The Cochrane Hepato‐Biliary Group Controlled Trials Register	Date will be given at review stage.	(liver OR hepatic) AND (transplant* OR graft*) AND 'duct anastomosis' OR "biliary anastomosis" OR 'Biliary reconstruction' OR (choledochocholedochostomy OR "t‐tube" OR drain* OR )
Cochrane Central Register of Controlled Trials (CENTRAL)	Latest issue	#1 liver OR hepatic #2 transplant* OR graft* #3 (#1 AND #2) #4 MeSH descriptor Liver Transplantation explode all trees #5 (#3 OR #4) #6 MeSH descriptor Biliary Tract Surgical Procedures explode all trees #7 MeSH descriptor Anastomosis, Surgical explode all trees #8 MeSH descriptor Drainage explode all trees #9 choledochocholedochostomy OR "duct anastomosis" OR "biliary anastomosis" OR "t‐tube" OR drain* #10 (#6 OR #7 OR #8 OR #9) #11 (#5 AND #10)
MEDLINE Ovid	1946 to the date of search	("Biliary Tract Surgical Procedures"[MeSH] OR "Anastomosis, Surgical"[MeSH] OR "duct anastomosis" OR "biliary anastomosis" OR "biliary reconstruction" OR "Drainage"[MeSH] OR "t‐tube" OR drain* OR choledochocholedochostomy ) AND (((liver OR hepatic) AND (transplant* OR graft*)) OR "Liver Transplantation"[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	1974 to the date of search	1 LIVER OR HEPATIC 2 TRANSPLANT$ OR GRAFT$ 3 1 AND 2 4 LIVER‐TRANSPLANTATION#.DE. 5 3 OR 4 6 5 AND 11 7 BILIARY‐TRACT‐SURGERY#.DE. 8 BILE‐DUCT#.DE. AND ANASTOMOSIS#.W..DE. 9 DUCT ADJ ANASTOMOSIS OR BILIARY ADJ ANASTOMOSIS OR BILIARY ADJ RECONSTRUCTIONC OR CHOLEDOCHOCHOLEDOCHOSTOMY OR T‐TUBE OR DRAIN$ 10 SURGICAL‐DRAINAGE#.DE. OR DRAIN#.W..DE. 11 7 OR 8 OR 9 OR 10 12 RANDOMIZED‐CONTROLLED‐TRIAL#.DE. OR RANDOMIZATION#.W..DE. OR CONTROLLED‐STUDY#.DE. OR MULTICENTER‐STUDY#.DE. OR PHASE‐3‐CLINICAL‐TRIAL#.DE. OR PHASE‐4‐CLINICAL‐TRIAL#.DE. OR DOUBLE‐BLIND‐PROCEDURE#.DE. OR SINGLE‐BLIND‐PROCEDURE#.DE. 13 RANDOM$ OR CROSSOVER$ OR CROSS‐OVER OR CROSS ADJ OVER OR FACTORIAL$ OR PLACEBO$ OR VOLUNTEER$ 14 (SINGLE OR DOUBLE OR TREBLE OR TRIPLE) NEAR (BLIND OR MASK) 15 12 OR 13 OR 14 16 15 AND HUMAN=YES 17 6 AND 16
LILACS (Bibioteca Virtual em Saúde ‐ BVS)	1982 to the date of search	(Liver transplantation) [Word] and biliary anastom$ [Word]
Science Citation Index Expanded (Web of Science)	1900 to the date of search	#1 TS=('duct anastomosis' OR "biliary anastomosis" OR 'Biliary reconstruction' OR choledochocholedochostomy OR "t‐tube" OR drain*) #2 TS=(liver OR hepatic) #3 TS=(transplant* OR graft*) #4 TS=(random* OR blind* OR placebo* OR meta‐analysis) #5 #4 AND #3 AND #2 AND #1
Conference Proceedings Citation Index ‐ Science (Web of Science)	1990 to the date of search	#1 TS=('duct anastomosis' OR "biliary anastomosis" OR 'Biliary reconstruction' OR choledochocholedochostomy OR "t‐tube" OR drain*) #2 TS=(liver OR hepatic) #3 TS=(transplant* OR graft*) #4 TS=(random* OR blind* OR placebo* OR meta‐analysis) #5 #4 AND #3 AND #2 AND #1
CINAHL (EBSCO)	1961 to the date of search	S7 S3 AND S6 S6 S4 OR S5 S5 MW biliary anastomosis S4 TX duct anastomosis S3 S1 OR S2 S2 MW liver transplantation S1 TX liver
PEDro	1955 to the date of search	Liver transplantation