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Br J Obstet Gynaecol. 1976 Aug;83(8):656-9. doi: 10.1111/j.1471-0528.1976.tb00906.x.
Cervical mucus and identification of the fertile phase of the menstrual cycle.
Flynn AM, Lynch SS
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Br J Obstet Gynaecol. 1976 Aug;83(8):656-9. doi: 10.1111/j.1471-0528.1976.tb00906.x.
Flynn AM, Lynch SS