Shirin 2009.

Methods	Randomised clinical trial, quote: "The cases were assigned to two groups through simple random sampling"
Participants	100 infertile, 20 to 35‐year‐old women with PCOS attending Vali‐e‐Asr Infertility Clinic from April 2003 to April 2007
Interventions	Group A: CC plus hMG Group B: letrozole plus hMG
Outcomes	Pregnancy, miscarriage and multiple pregnancy rates
Notes	The article was written in Persian, but we were not able to have it translated properly.

BMI: body mass index; CC: clomiphene citrate; ESHRE/ASRM: European Society for Human Reproduction and Embryology/American Society for Reproductive Medicine; hCG: human chorionic gonadotropin; hMG: human menopausal gonadotropin; LH: luteinising hormone; FSH: follicle‐stimulating hormone; NAC: N‐acetyl cysteine; PCO: polycystic ovaries; PCOS: polycystic ovary syndrome; PCOD: polycystic ovary disease; LOD: laparoscopic ovarian drilling; OHSS: ovarian hyperstimulation syndrome; W: watts; WHO: World Health Organisation