Thirty young normal-weight anovulatory PCOS women will be enrolled. The diagnosis of PCOS will be based on the presence of clinical [Ferriman-Gallwey score ≥ 8] or biochemical hyperandrogenism (serum testosterone levels (>2 SD above our reference mean values) and chronic anovulation [serum luteal progesterone (P) below 2 ng/mL)].