Rosch 1997.

Methods	RCT
Participants	Malignant distal biliary obstruction Inoperable / Iresectable
Interventions	Metal Wallstent Plastic stent with side‐holes Plastic stent without side‐holes
Outcomes	Stent failure rates at 4 months
Notes	N=75
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	Unclear risk	Not described
Allocation concealment?	Unclear risk	Not described
Blinding? All outcomes	High risk
Incomplete outcome data addressed? All outcomes	High risk	Not described
Free of selective reporting?	High risk	Outcoems not described completely
Free of other bias?	Unclear risk	Abstract only