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22 year old woman has 9 months of amenorrhea after discontinuing the combined oral contraceptive pill. She is a keen distance runner and trains daily. Her weight is stable and her BMI is 19. Investigations: Prolactin - 520 U/L (100-500) LH - 1 U/L (1-11) FSH - 2 U/L (2-8) Estradiol - <50 pmol/L (70-510). Dysfunction at which level of the hypothalamic-pituitary-ovarian axis is most likely to explain these results?

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