Badawy 2009.

Methods	A randomised controlled trial
Participants	The study comprised 163 women (aged 18 – 32 years) with CC‐resistant PCOS among those attending the Outpatient Clinic at the Mansoura University Hospitals, Mansoura, Egypt, and a private practice setting in the period from January 2005 to January 2007
Interventions	Participants were randomly allocated to either treatment with ultrasound‐guided transvaginal needle ovarian drilling (UTND; n = 82) or laparoscopic electrosurgery ovarian drilling (n = 81)
Outcomes	Normal menstruation, hirsutism and acne, testosterone. No harms reported.
Notes	Funding source: Not stated Declarations of interest: "All authors have nothing to declare".
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	"computer‐generated random table"
Allocation concealment (selection bias)	Unclear risk	Not stated
Blinding of participants and personnel (performance bias) All outcomes	High risk	Not stated but not possible with study design
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not stated
Incomplete outcome data (attrition bias) All outcomes	Low risk	No attrition
Selective reporting (reporting bias)	Low risk	None detected
Other bias	Low risk	None detected