Uen 2007.

Methods	Randomised clinical trial.
Participants	Country: Taiwan. Number randomised: 80. Mean age: 50 years. Females: 51 (64.6%). Inclusion criteria: 1. Participants who were classified as ASAI and II. 2. Undergoing elective laparoscopic cholecystectomy for symptomatic gallstones.
Interventions	The participants were randomised to the following groups: Group 1: abdominal wall lift (n = 40). Group 2: pneumoperitoneum with 8 mm Hg (n = 39). Device used for abdominal lift: subcutaneous device.
Outcomes	The outcomes reported were complications and operating time.
Notes	One withdrawal ‐ additional procedure for choledocholithiasis.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Comment: This information was not available.
Allocation concealment (selection bias)	Unclear risk	Quote: "Patient group allocation took place on the day prior to the study commencing, using randomly distributed, numbered and sealed envelopes." Comment: Further information about the envelopes was not available.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Comment: This information was not available.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Comment: This information was not available.
Incomplete outcome data (attrition bias) All outcomes	High risk	Comment: There were post‐randomisation drop‐outs.
Selective reporting (reporting bias)	Low risk	Comment: All important outcomes were reported.
Vested interest bias	Unclear risk	Comment: This information was not available.