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Diagnostic criteria and 4 main phenotypes of polycystic ovary syndrome (PCOS). *Hyperandrogenism: either testosterone above threshold and/or the presences of hirsutism or acne or androgenic alopecia. *Oligo-anovulation: eight or less ovulations per year. *Polycystic ovaries: ovarian volume > 10 mL and/or antral follicles number as defined above and less than 9 mm in size at least in one ovary.
