NCT02551367.

Methods	Randomised controlled trial
Participants	110 infertile women diagnosed with PCOS, aged 20‐35, distributed randomly
Interventions	55 women will receive letrozole 2.5 mg twice daily orally from the 2nd to the 6th day of the cycle for 3 successive cycles. 55 women will receive CC 50 mg twice daily orally from the 2nd to the 6th day of the cycle for 3 successive cycles.
Outcomes	Rate of ovulation assessed by number of mature follicles produced per cycle Serum progesterone level on day 21 (assessed up to 24 weeks) Mean endometrial thickness (assessed up to 24 weeks) Chemical pregnancy (assessed up to 24 weeks) Ongoing pregnancy (assessed up to 24 weeks)
Notes	We found no trial data, although trial completed since 2016 on clinicaltrials.gov