Assertion: amenorrhea's cause | /r/HasProperty | characterized by anovulation
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Source sentences:
text: The most common cause in this setting is polycystic ovarian syndrome (PCOS), which is characterized by anovulation, oligo-ovulation, androgen excess (clinical or biochemical), ultrasonographic demonstration of increased ovarian stroma and accumulation of antral follicles (polycystic appearance), and obesity.