(2006) and Sahin et al. (2004) is not correct. Khorram et al. randomized patients between metformin plus clomiphene and clomiphene alone. Metformin was started in the same cycle as was clomiphene. Sahin et al. did treat the patients with metformin 3 months prior to administrating clomiphene, but all patients also received clomiphene, which also makes the comparison justifiable. Both these studi...

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