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Am J Obstet Gynecol. 2014 Oct;211(4):358.e1-6. doi: 10.1016/j.ajog.2014.04.041. Epub 2014 May 4.

Premenstrual spotting of ≥2 days is strongly associated with histologically confirmed endometriosis in women with infertility.

Heitmann RJ, Langan KL, Huang RR, Chow GE, Burney RO

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