Bansal 2010.

Methods	Randomised trial. LC + CBDE vs pre‐operative ERCP +LC. Drop‐outs or protocol violations reported. Sample size calculation: no.
Participants	All India Institute of Medical Sciences, India. July 2007 to April 2008. Mean age: Group I: 47.1 yrs vs Group II 39.07 yrs. Pre‐operative confirmation of CBD stones: EUS or MRCP. CBD more than 10 mm size.
Interventions	Gr I: LC + LCBDE (15 pts). Gr II: pre‐operative ERCP + LC 4 ‐ 6 weeks later (15 pts).
Outcomes	CBD clearance, bleeding, bile leak, pancreatitis, average hospital stay, pain scores (VAS).
Notes	Choledochoscopy performed. T‐tube placed after lap CBD exploration.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer‐generated random number sequences.
Allocation concealment (selection bias)	Low risk	Concealed envelopes with block randomisation design.
Blinding of participants and personnel (performance bias) All outcomes	High risk	Not possible.
Selective reporting (reporting bias)	Low risk	All outcomes were clearly defined and reported.
Incomplete outcome data	High risk	Missing pts were not accounted.
For‐profit bias	Low risk	None.
Other bias	Low risk	None.