https://www.health.harvard.edu/womens-health/perimenopause-rocky-road-to-menopause

https://healthy.kaiserpermanente.org/health-wellness/healtharticle.phases-of-the-menstrual-cycle

https://menopause.org/press-releases/when-women-initiate-estrogen-therapy-matters

https://www.nhs.uk/medicines/hormone-replacement-therapy-hrt/benefits-and-risks-of-hormone-replacement-therapy-hrt/ 

https://www.abebooks.com/9780961462048/Menopausal-Years-Wise-Woman-Way-0961462043/plp

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