Petersen 2005.

Methods	Randomised trial
Participants	150 Women from Brazil undergoing ART cycles All participants had one failed treatment cycle Mean age 34 years
Interventions	ICSI cycles only AH quarter‐laser thinning versus control AH: 35 women with one previous implantation failure, 40 women with repeated implantation failures Control: 35 women with one previous implantation failure, 40 women with repeated implantation failures
Outcomes	Live birth, clinical pregnancy, miscarriage and multiple pregnancy
Notes	Author response No. of ET: mean 2.7
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Random number table
Allocation concealment (selection bias)	Unclear risk	Unclear ‐ a code ID to mask identity of the participant but not clear how or who generated this
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Not stated
Incomplete outcome data (attrition bias) All outcomes	Low risk	All women randomised appear to have been analysed
Selective reporting (reporting bias)	Unclear risk	Original protocol not viewed but authors did report on live birth