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Obstet Gynecol. 1980 Mar;55(3):333-9. doi: 10.1097/00006250-198003000-00013.
Natural family planning. II. Basal body temperature and estimated time of ovulation.
Hilgers TW, Bailey AJ
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Obstet Gynecol. 1980 Mar;55(3):333-9. doi: 10.1097/00006250-198003000-00013.
Hilgers TW, Bailey AJ