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Obstet Gynecol. 1978 Nov;52(5):575-82.

Natural family planning. I. The peak symptom and estimated time of ovulation.

Hilgers TW, Abraham GE, Cavanagh D

https://pubmed.ncbi.nlm.nih.gov/724176/

Research Library references an ever-growing number of academic resources related to restorative reproductive medicine.

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