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To compare the effectiveness of letrozole and clomiphene citrate (CC) in induction of ovulation in polycystic ovary syndrome (PCOS).Prospective, randomized, not blinded, controlled trial.A tertiary level infertility care center.Sixty-four anovulatory patients with PCOS, who failed to ovulate when taking 100 mg/day CC in previous cycles.Patients were randomly divided into two groups by lottery and...