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J Obstet Gynecol Neonatal Nurs. 2014 May-Jun;43(3):351-8. doi: 10.1111/1552-6909.12307. Epub 2014 Apr 22.

Cohort efficacy study of natural family planning among perimenopause age women.

Fehring RJ, Mu Q

https://doi.org/10.1111/1552-6909.12307

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