Database	Time span	Search strategy
The Cochrane Hepato‐Biliary Group Controlled Trials Register	October 2006.	(ERCP OR 'endoscopic retrograde cholangiopancreaticography' OR 'endoscopic retrograde cholangiopancreatography') AND (pancreaticobiliary OR pancreatobiliary OR (pancreat* AND biliary)) AND stricture*
Cochrane Central Register of Controlled Trials (CENTRAL) in The Cochrane Library	Issue 2 of 2006.	#1 MeSH descriptor Cholangiopancreatography, Endoscopic Retrograde explode all trees in MeSH products #2 ERCP or endoscopic retrograde cholangiopancreat*graphy in All Fields in all products #3 (#1 OR #2) #4 pancreat*biliary and stricture* in All Fields in all products #5 (#3 AND #4)
MEDLINE (WinSPIRS 5.0)	1950 to October 2006.	#1 explode "Cholangiopancreatography‐Endoscopic‐Retrograde"/ all subheadings #2 ERCP or endoscopic retrograde cholangiopancreat*graphy #3 #1 or #2 #4 pancreat*biliary and stricture* #5 #3 and #4 #6 random* or blind* or placebo* or meta‐analysis #7 #5 and #6
EMBASE (WinSPIRS 5.0)	1980 to October 2006.	#1 explode "endoscopic‐retrograde‐cholangiopancreatography"/ all subheadings #2 ERCP or endoscopic retrograde cholangiopancreat*graphy #3 #1 or #2 #4 pancreat*biliary and stricture* #5 #3 and #4 #6 random* or blind* or placebo* or meta‐analysis #7 #5 and #6
Science Citation Index EXPANDED (http://portal.isiknowledge.com/portal.cgi?DestApp=WOS&Func=Frame)	1945 to October 2006.	#1 TS=(ERCP or endoscopic retrograde cholangiopancreat*graphy) #2 TS=(pancreat*biliary and stricture*) #3 #2 AND #1 #4 TS=(random* or blind* or placebo* or meta‐analysis) #5 #4 AND #3