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Polycystic ovary syndrome (PCOS) with the characteristics of androgen excess,ovulatory dysfunction and polycystic ovaries is the most common cause of anovulatory infertility.It is estimated that PCOS affects 5-10% of reproductive-aged females worldwide (5.6% of Han Chinese population).The pathogenesis of PCOS is unclear, but we can hypothesize that POPs could be involved in PCOS.Population-based data regarding the association are sparse.