Sung 1999.

Methods	Generation of the allocation sequence: method unclear. Allocation concealment: sealed envelopes. Blinding: Not blinded. Intention‐to‐treat: Yes. Exclusions from analysis: three in each group (four ‐ surgery, one lost to follow up and one technical failure of stenting). Follow up period: 140 days. Jadad‐score: 3.
Participants	Fifty‐eight patients with malignant biliary stricture and endoscopically inserted biliary polyethylene stent.
Interventions	Ciprofloxacin (250 mg twice a day) versus no treatment.
Outcomes	Duration of stent patency. Mortality.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear